Heterocyclic Building Blocks-Benzoxazole

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Furan compounds. V. Preparation and configuration of furyl ketoximes, published in 1958, which mentions a compound: 3194-15-8, mainly applied to , Name: 1-(Furan-2-yl)propan-1-one.

cf. C.A. 45, 5676i. Several pairs of syn- and anti-furyl ketoximes were prepared, characterized, and their configuration established chem. and by UV absorption spectra determinations NaOH (100 g.) in 110 mL. H2O stirred with cooling with 86.9 g. HONH2.HCl in 220 mL. H2O and the mixture stirred 3 h. at 25-30° with 110 g. 2-furyl Me ketone, 2-RC4H3O (I) (R = Ac), the solution treated with 200 mL. saturated NH4Cl solution and the product washed with H2O yielded 80% anti-2-furyl Me ketoxime, anti-2-RC4H3O (II) (R = MeC:NOH) (IIa), m. 104°; HCl salt, m. 85-90°. IIa (10 g.) in 250 mL. Et2O at 0° saturated with dry HCl until the initial precipitate redissolved and the solution kept overnight, evaporated in vacuo and the residue washed with 2N Na2CO3, filtered and the precipitate recrystallized (H2O) gave 6.5 g. syn-IIa, m. 74°; HCl salt, m. 128-9°. Syn-IIa (1 g.) in 10 mL. 2N H2SO4 at 80° kept overnight at room temperature, neutralized with 2N Na2CO3, and the product crystallized (alc.) gave 0.6 g. anti-IIa. Furan (102 g.) and 390.4 g. (EtCO)2O at 40° treated in 5 min. with 15 mL. 85% H3PO4 and the mixture stirred 1 h. at 60-5°, the cooled mixture neutralized with 600 mL. 50% KOH and extracted repeatedly with Et2O, the extract dried (Na2SO4) and evaporated yielded 72% I (R = EtCO) (Ia), b11 74-5°. NaOH (50 g.) in 150 mL. H2O stirred with cooling with 43.5 g. HONH2.HCl in 150 mL. H2O and the mixture treated dropwise with 62.1 g. Ia at 25-30°, the mixture stirred 3 h. and the solution treated with 120 mL. saturated NH4Cl solution, the solidified product filtered off and taken up in 180 mL. alc., the filtered solution chilled, and diluted with 400 mL. H2O gave 35 g. pure anti-II (R = EtC:NOH) (IIb), m. 73°. Working up the mother liquor yielded 23 g. impure anti-IIb, m. 48-50°. Conversion of anti-IIb through the HCl salt in Et2O and crystallization of the crude product (dilute alc.) yielded 83% authentic syn-IIb, m. 77-8°. HONH2.HCl (46 g.), 56.2 g. anhydrous NaOAc, and 94.6 g. I (R = Bz) refluxed 1 h. in 550 mL. absolute alc. and the solution filtered hot, the residue washed with 140 mL. absolute alc. and the filtrate and washings kept 2 days, filtered, and the product recrystallized (EtOAc) yielded 23% anti-II (R = PhC:NOH) (IIc), m. 161°. Concentration of the mother liquor and treatment of the isomeric mixture (72 g., m. 132-5°) with HCl in Et2O yielded 96% syn-IIc, m. 149° (dilute alc.). Ac2O (510 g.) and 205.3 g. α-methylfuran treated as above with 25 g. 85% H3PO4 yielded 38% 5-methyl-2-furyl Me ketone (III), b12 78-80°. III (115 g.) in 650 mL. alc. and 77.6 g. HONH2.HCl in 240 mL. H2O containing 95.4 g. anhydrous NaOAc kept 16 h. and evaporated in vacuo with passage of 400-50 mL. alc., the concentrate diluted with 1 l. H2O and the solution chilled, 1 h. filtered, and the crystalline product (117 g.) recrystallized (400 mL. C6H6 and 100 mL. C6H6) gave 66 g. pure anti-5-methyl-2-furyl Me ketoxime (anti-IV), m. 83°. Concentration of the 2 mother liquors and treatment with HCl in Et2O yielded 88% syn-IV, m. 109°. HONH2.HCl (69.5 g.) in 120 mL. H2O and 100 g. NaOH in 120 mL. H2O added to a hot solution of 111 g. 2-benzofuryl Ph ketone (V) (cf. Stoermer, et al., C.A. 18, 2160) in 2 l. MeOH and the mixture boiled 20 min., concentrated and the residue treated with 750 mL. H2O and 250 mL. saturated NH4Cl solution, the precipitate taken up in a min. of alc., and the filtered solution diluted with H2O gave 111 g. isomeric mixture of anti- and syn-2-benzofuryl Ph ketoxime (anti-VI and syn-VI) (VII). VII (53.4 g.) shaken with 267 mL. Ac2O and the solution kept 1 day, filtered from 10.6 g. anti-VI acetate (VIa), m. 146°, and the filtrate diluted with 2 volumes ice H2O, neutralized with solid Na2CO3, and the solid product (50 g.) recrystallized (alc. and EtOAc) gave 18.9 g. VIa. VIa (20 g.) heated in 200 mL. 2N NaOH and the cooled solution diluted with 200 mL. H2O, stirred with 85 mL. saturated NH4Cl solution and filtered, the precipitate washed with H2O and dried in vacuo, taken up in a min. of warm PhMe and the filtered solution treated with petr. ether, the crude oxime (11.7 g., m. 140-53°) taken up in hot alc., and the solution diluted with H2O gave 10 g. anti-VI, m. 156°. Rearrangement of VII or pure anti-VI with HCl in Et2O gave syn-VI, m. 145° (dilute MeOH). anti-2-Benzofuryl Me ketoxime (anti-VIII), m. 154-5° (cf. C.A. 44, 2973d), rearranged yielded 84% syn-VIII, m. 161°. The oximes shaken with 10 volumes Ac2O and the solutions kept 3 h., poured into ice H2O, and neutralized with Na2CO3 gave the acetates. The oximes (0.01 mol) in 10 mL. C5H5N acetylated with equivalent amounts of BzCl or p-MeC6H4SO2Cl at -5 to -10°, kept 1 h. at 0° and poured into ice H2O, filtered, and the precipitate washed with H2O and dried over H2SO4 and KOH gave the benzoates and tolylsulfonates [oxime, and m.p. (solvent of crystallization) of acetate, benzoate, and tolylsulfonate given]: syn-IIa, 75° (H2O), 84° (petr. ether), 88° (C6H6-petr. ether); anti-IIb, 94° (petr. ether), 93° (petr. ether), 68°; anti-IIc, 109-10° (petr. ether), 144° (EtOAc), 84° (Me2CO-H2O); syn-IIc, 68° (petr. ether), 99-100° (alc.), 118°; anti-IV, 66° (petr. ether), 86° (petr. ether), 72° (decomposition) (C6H6-petr. ether); syn-IV, 94° (petr. ether), 95° (petr. ether), 112°; anti-VIII, 95-6° (petr. ether), 135-6° (alc.), 100-2°; syn-VIII, 77° (petr. ether), 90° (petr. ether), 140° (Me2COH2O); anti-VI, 146°, 152° (alc.), 116-18° (C6H6-petr. ether); syn-VI, 81° (alc.), 120° (alc.), 112° (C6H6-petr. ether). Anti-VI (10.2 g.) in 20 mL. C5H5N treated gradually at -5 to -10° with 9 g. r-MeC6H4SO2Cl and the mixture kept 1 h. at 0°, poured into 150 mL. ice H2O and the oily product triturated with Me2CO, the trituration diluted with H2O and filtered, and the precipitate washed with 2N HCl and H2O gave 15.25 g. anti-VI p-toluenesulfonate, m. 116-18° (Me2CO-ice H2O and C6H6-petr. ether). The preparation of the pairs of ketoximes permitted for the 1st time a systematic comparative spectroscopic examination UV absorption spectra for furfural oxime (IX), IIa, IIb, and IV showed a single maximum at 270 mμ, IIc had 2 maximum, and the spectra of VI and VIII were complicated. The syn- and anti-isomers showed a small difference in wave length but a larger difference in intensity. Based on the established configuration of IX, the chem. assigned configurations were spectroscopically confirmed. The preferential formation of anti-isomers in alk. media and of isomeric mixtures in neutral or acid media and the mechanism of the rearrangement in ethereal HCl were discussed.

Here is a brief introduction to this compound(3194-15-8)Name: 1-(Furan-2-yl)propan-1-one, if you want to know about other compounds related to this compound(3194-15-8), you can read my other articles.

Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

Formula: C7H8O2. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 1-(Furan-2-yl)propan-1-one, is researched, Molecular C7H8O2, CAS is 3194-15-8, about New Components with Potential Antioxidant and Organoleptic Properties, Detected for the First Time in Liquid Smoke Flavoring Preparations. Author is Guillen, Maria D.; Ibargoitia, Maria L..

A com. aqueous smoke preparation was exhaustively extracted, using dichloromethane as solvent, until the carrier had totally lost its smoky odor. Qual. and quant. characterizations of the extract were performed by means of gas chromatog./mass spectrometry and gas chromatog. with flame ionization detector, resp. Carbonyl derivatives including aldehydes and ketones as well as acids and esters are almost absent; however, the high proportion of phenol, guaiacol, and syringol derivatives is noticeable. The presence of di-tert-butylhydroxytoluene, several hopanes, and a number of lignin dimers must be pointed out; these latter components had apparently not been detected before either in smoke flavorings or in wood smoke. The mass spectral data of the compounds considered as lignin dimers and of the unidentified components are given. The presence of lignin dimers is very interesting from the point of view of health and food technol. for their therapeutic, organoleptic, and antioxidant properties.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《A novel cyclodehydration. Thermal conversion of diethyl 2-naphthyloxyoxalacetate to diethyl naphtho[2,1-b]furan-1,2-dicarboxylate》. Authors are Takemura, K. H..The article about the compound:1-(Furan-2-yl)propan-1-onecas:3194-15-8,SMILESS:O=C(C1=CC=CO1)CC).Formula: C7H8O2. Through the article, more information about this compound (cas:3194-15-8) is conveyed.

Diethyl 2-naphthyloxyoxalacetate, when heated at 205° did not undergo the expected decarbonylation to give diethyl 2-naphthyloxymal-onate, but instead cyclized to yield diethyl naphtho[2,1-b]furan-1,2-dicarboxylate. The same cyclization was effected in AcOH-H2SO4 and with p-MeC6H4SO3H in toluene. Diethyl 2-naphthyl-oxymalonate was prepared from sodium 2-naphthoxide and diethyl chloromalonate. The reaction of sodium 2-naphthoxide with diethyl bromomalonate afforded diethyl 2-naphthyloxymalonate and diethyl bis(2-naphthyloxy)malonate, both in poor yields.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

Computed Properties of C9H9NO. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 2-Ethylbenzo[d]oxazole, is researched, Molecular C9H9NO, CAS is 6797-13-3, about Mild and efficient synthesis of benzoxazoles, benzothiazoles, benzimidazoles, and oxazolo[4,5-b]pyridines catalyzed by Bi(III) salts under solvent-free conditions. Author is Mohammadpoor-Baltork, Iraj; Khosropour, Ahmad R.; Hojati, Seyedeh F..

A series of benzoxazoles, benzothiazoles, benzimidazoles, and oxazolo[4,5-b]pyridines was efficiently synthesized from the reactions of o-aminophenols, o-aminothiophenol, o-phenylenediamines, and 2-amino-3-hydroxypyridine with orthoesters in the presence of catalytic amounts of Bi(III) salts, such as Bi(TFA)3, Bi(OTf)3, and BiOClO4 · xH2O under solvent-free conditions. The remarkable features of this new protocol are high conversion, very short reaction times, cleaner reaction profiles under solvent-free conditions, straightforward procedure, and use of relatively non-toxic catalysts.

There is still a lot of research devoted to this compound(SMILES：CCC1=NC2=CC=CC=C2O1)Computed Properties of C9H9NO, and with the development of science, more effects of this compound(6797-13-3) can be discovered.

Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

Berhal, Farouk; Wu, Zi; Genet, Jean-Pierre; Ayad, Tahar; Ratovelomanana-Vidal, Virginie published an article about the compound: (R)-5,5′-Bis(diphenylphosphino)-2,2,2′,2′-tetrafluoro-4,4′-bi-1,3-benzodioxole( cas:503538-69-0,SMILESS:FC1(F)OC2=CC=C(P(C3=CC=CC=C3)C4=CC=CC=C4)C(C5=C6OC(F)(F)OC6=CC=C5P(C7=CC=CC=C7)C8=CC=CC=C8)=C2O1 ).Recommanded Product: (R)-5,5′-Bis(diphenylphosphino)-2,2,2′,2′-tetrafluoro-4,4′-bi-1,3-benzodioxole. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:503538-69-0) through the article.

Applications of electron-deficient DIFLUORPHOS and SYNPHOS analogs in the rhodium-catalyzed asym. conjugate addition of boronic acids to α,β-unsaturated ketones afford the 1,4-addition adducts e. g., I and II in yields up to 92% and with 99% ee. Particularly, a Rh-catalyzed asym. 1,4-addition of arylboronic acids to nonsubstituted maleimide substrates using the (R)-3,5-diCF3-SYNPHOS ligand is also reported. This protocol provides access to various enantioenriched 3-substituted succinimide units of biol. interest, in high yields and good to excellent ee up to 93%, which could be upgraded up to 99% ee, after a single crystallization

There is still a lot of research devoted to this compound(SMILES：FC1(F)OC2=CC=C(P(C3=CC=CC=C3)C4=CC=CC=C4)C(C5=C6OC(F)(F)OC6=CC=C5P(C7=CC=CC=C7)C8=CC=CC=C8)=C2O1)Recommanded Product: (R)-5,5′-Bis(diphenylphosphino)-2,2,2′,2′-tetrafluoro-4,4′-bi-1,3-benzodioxole, and with the development of science, more effects of this compound(503538-69-0) can be discovered.

Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Journal of the American Chemical Society called Super-aromatic properties of furan. II. The Friedel-Crafts reaction, Author is Gilman, Henry; Calloway, N. O., which mentions a compound: 3194-15-8, SMILESS is O=C(C1=CC=CO1)CC, Molecular C7H8O2, HPLC of Formula: 3194-15-8.

cf. C. A. 27, 502. 2-Furyl Ph ketone, tert-BuCl and AlCl3 give 30% of 5-tert-butyl-2-furyl Ph ketone, b20 180-2°, d2525 1.065, nD25 1.5665; this also results in 70% yield from 5-tert-butyl-2-furoyl chloride (b. 220°, d2525 1.108, nD25 1.5091), C6H6 and AlCl3. 2-Furfural and iso-PrCl with AlCl3 in CS2 give an aldehyde (dihydrofuran derivative), C8H12O2, b21 101-3°, d2525 1.023, nD25 1.5041 (semicarbazone, m. 174-6°); oxidation with alk. Ag2O gives an acid (dihydroisopropylfuroic acid or a ring-scission product), m. 76-7°; it is unchanged on heating with PCl5; the aldehyde, Ac2O and AcONa give 40% of a dihydroisopropyl-furylacrylic acid (?), m. 102-3°. The following alkyl 2-furyl ketones were prepared from furan and acid chloride with AlCl3 in CS2: Et, b17 78-80°, m. 27-8° (36.3% yield); Pr, b19 95-7°, d2525 1.041, nD25 1.4922 (51.8%); iso-Pr, b18 86-7°, d. 1.032, n 1.4888 (45.3%); Bu, b18 108-9°, d. 1.012, n 1.4900 (23%) (semicarbazone, m. 158-9°); Am, b16 116-9°, d. 0.9954, n 1.4864 (39%) (semicarbazone, m. 110-2°); the yields of ketones prepared from 2-furylmercuric chloride were: Et 24.2, Pr 18.1, iso-Pr 14.5, Am 18%. Alkylation of Me 2-furoate with AlCl3 in CS2 gave the following Me 5-alkyl-2-furoates: iso-Pr, b20 110-2°, d. 1.076, n 1.4851; tert-Bu, b15 110-4°, d. 1.037, n 1.4792; Am, b13 112-6°, d. 1.032, n 1.4804; hexyl, b19 132-6°, d. 1.016, n 1.4814; the corresponding acids m. 65-6°, 104-5°, 69-70° and 36-7°, resp. The reaction of MeCl gives a compound, m. 102-3°, which may be 5-carbomethoxy-2-carbodithiomethoxyfuran. Et furyl ketone and MeMgI give 66.3% of methylethyl-2-furylcarbinol, b19 77-8°, d. 1.023, n 1.4729; dehydration gives sec-butyl-2-furan, b. 132-5°. The following 2-alkylfurans were prepared by reduction of the ketone or decarboxylation of the acids: Pr, b. 114-6°, d. 0.882, n 1.4410 (36%); iso-Pr, b. 106-9°, d. 0.8771, n 1.4466 (55%); Bu, b. 137-8°, d. 0.8983, n 1.4460 (53.8%); iso-Bu, b. 123-7°, d. 0.886, n 1.4425 (32%); sec-Bu, b. 132-5°; tert-Bu, b. 119-20°, d. 0.8708, n 1.4380 (60%); the corresponding alkyl-2-furylmercuric chlorides m. 99°, 117-8°, 79-80°, 95-6, 88° and 136-7°, resp. AlCl3 appears to be ineffective in a Friedel-Crafts reaction of the ester with Ac2O or AcCl. Et furoate, Ac2O, SnCl4 and C6H6 give 30% of Et 5-acetyl-2-furoate, m. 85-6°, the corresponding keto acid decomposes on heating and with Cu bronze gives Me 2-furyl ketone. Me 5-butyryl-2-furoate m. 67-8°; the free acid m. 172°. 2,4-Dimethyl-3-furyl Ph ketone, b15 140°, d. 1.152, n 1.5602, results in 7% yield with AlCl3 and in 29% yield with SnCl4. Me anisate and iso-PrCl with AlCl3 in CS2 give 33.6% of Me 3-isopropyl-4-methoxybenzoate, b25 162-5°, d. 1.074, n 1.5236; the free acid m. 162-3°. Et isopropyl-α-naphthoate, b20 198-203°, d. 1.077, n 1.5760; the acid m. 68-72°. Et butyl-α-naphthoate, b18 230-5°, d. 1.0131, n 1.5552. The preferential and exclusive substitution in the furan nucleus of a sym. ketone like 2-furyl Ph ketone and the alkylation and acylation of Et furoate but not of BzOEt, together with the fact that C6H6 can be used as a medium for some Friedel-Crafts reactions of furan are advanced as addnl. supporting evidence for the concept that furan has super-aromatic properties.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

Safety of (R)-5,5′-Bis(diphenylphosphino)-2,2,2′,2′-tetrafluoro-4,4′-bi-1,3-benzodioxole. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: (R)-5,5′-Bis(diphenylphosphino)-2,2,2′,2′-tetrafluoro-4,4′-bi-1,3-benzodioxole, is researched, Molecular C38H24F4O4P2, CAS is 503538-69-0, about Highly efficient and enantioselective hydrogenation of quinolines and pyridines with Ir-Difluorphos catalyst. Author is Tang, Weijun; Sun, Yawei; Xu, Lijin; Wang, Tianli; Fan, Qinghua; Lam, Kim-Hung; Chan, Albert S. C..

The combination of the readily available chiral bisphosphine ligand Difluorphos with [Ir(COD)Cl]2 in THF resulted in a highly efficient catalyst system for asym. hydrogenation of quinolines at quite low catalyst loadings (0.05-0.002 mol%), affording the corresponding products with high enantioselectivities (up to 96%), excellent catalytic activities (TOF up to 3510 h-1) and productivities (TON up to 43000). The same catalyst was also successfully applied to the asym. hydrogenation of trisubstituted pyridines with nearly quant. yields and up to 98% ee. In these two reactions, the addition of I2 additive is indispensable; but the amount of I2 has a different effect on catalytic performance.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 27231-36-3, is researched, SMILESS is SC1=NC2=CC(C)=CC=C2N1, Molecular C8H8N2SJournal, Japanese Journal of Toxicology and Environmental Health called Analysis of 2-mercaptobenzimidazole type antioxidants in rubber products, Author is Isama, Kazuo; Kaniwa, Masa-aki; Nakamura, Akitada, the main research direction is mercaptobenzimidazole antioxidant analysis HPLC rubber boot.Recommanded Product: 2-Mercapto-5-methylbenzimidazole.

A method for the determination of 2-mercaptobenzimidazole (MBI) type antioxidants in rubber products by HPLC was developed. The anal. conditions to sep. 2-mercapto-4-methylbenzimidazole (4MMBI) from 2-mercapto-5-methylbenzimidazole (5MMBI) by HPLC and to extract MBI type antioxidants from rubber products were examined in detail. The recommended method was as follows. MBI type antioxidants was extracted with MeOH 5 times. The evaporation residue of the extract was dissolved in water and injected to HPLC. The HPLC conditions were as follows: column, CAPCELL PAK C18 (4.6 i.d. × 250 mm); column temperature, 40°; mobile phase, 0.1 M phosphate buffer (pH 6.5)-acetonitrile (87:13); flow rate, 1.0 mL/min; detection wavelength 304 nm (MBI, 4MMBI) and 307 nm (5MMBI). This method was applied to determine MBI type antioxidants in 12 com. rubber boots. Consequently, 11.5-67.7 μg/g of MBI was detected in 4 samples, but 4MMBI and 5MMBI were not detected in any samples.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

Computed Properties of C38H24F4O4P2. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: (R)-5,5′-Bis(diphenylphosphino)-2,2,2′,2′-tetrafluoro-4,4′-bi-1,3-benzodioxole, is researched, Molecular C38H24F4O4P2, CAS is 503538-69-0, about Enantioselective alkynylation of N-sulfonyl α-ketiminoesters via a Friedel-Crafts alkylation strategy. Author is Liu, Ren-Rong; Zhu, Lei; Hu, Jiang-Ping; Lu, Chuan-Jun; Gao, Jian-Rong; Lan, Yu; Jia, Yi-Xia.

Enantioselective alkynylation of cyclic N-sulfonyl α-ketiminoesters I (R = H, 5-OMe, 7-Cl, etc.; R1 = Et, Me, i-Pr, n-Bu) with terminal alkynes R2CCH (R2 = C6H5, 3-FC6H4, 4-thien-2-yl, etc.) was developed by using an Ni(ClO4)2/(R)-DTBM-Segphos complex as a catalyst. A range of propargylic amides bearing quaternary stereocenters II was afforded in excellent enantioselectivities (up to 97% ee). Theor. studies revealed that this reaction proceeded via a Friedel-Crafts-type reaction pathway.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 33941-15-0, is researched, Molecular C12H25NO5, about Catalytic Systems for the Synthesis of Biscarbonates and Their Impact on the Sequential Preparation of Non-Isocyanate Polyurethanes, the main research direction is catalytic system biscarbonate isocyanate polyurethane.Name: 1,4,7,10,13-Pentaoxa-16-azacyclooctadecane.

The synthesis of non-isocyanate polyurethanes (NIPUs) has recently gained great attention. In this respect, a bifunctional catalyst and an abundant metal catalyst system were investigated for the conversion of polyfunctional epoxides to gain general access to the corresponding cyclic carbonates as monomers for NIPU synthesis. A Ca-based catalytic system and a bifunctional ammonium salt were established for the synthesis of these monomers. In total, 14 terminal polyfunctional epoxides were converted to the corresponding carbonates in yields up to 99% and high purities. With regard to the one-pot synthesis of NIPUs directly from epoxides and CO2, the influence of the catalyst systems was evaluated. In general, both catalytic systems allowed the synthesis of NIPUs in a sequential one-pot procedure yielding polymers with a mol. mass of up to 19 kg·mol-1. The synthesis of monomers bearing multiple cyclic carbonate-units and an easy access to NIPUs in a sequential one-pot-process is reported.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem