Aslanidis, P.; Cox, P. J.; Divanidis, S.; Karagiannidis, P. published the article 《Copper(I) halide complexes from cis-1,2-bis(diphenylphosphino) ethylene and some heterocyclic thiones》. Keywords: copper ethenediphosphine heterocyclic thione halo preparation; crystal structure copper ethenediphosphine triazolethione pyrimidinethione.They researched the compound: 2-Mercapto-5-methylbenzimidazole( cas:27231-36-3 ).Application In Synthesis of 2-Mercapto-5-methylbenzimidazole. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:27231-36-3) here.
Reaction of Cu(I) chloride or bromide with equimolar amounts of diphos (dppet), cis-1,2-bis(diphenylphosphino)ethylene and one of the heterocyclic thiones (L) pyridine-2-thione, pyrimidine-2-thione, 5-methyl-1,3,4-thiadiazole-2-thione, 4-methyl-5-trifluoromethyl-1,2,4-triazole-3-thione, benzoxazole-2-thione, or 5-methylbenzimidazole-2-thione in MeCN/MeOH afforded mononuclear complexes [CuX(dppet)(L)] with the diphosphine ligand acting as a chelating ligand. However, the same reaction carried out at higher temperatures proceeds, in some cases, with exclusion of the phosphine ligand from the coordination sphere leading to double-S-bridged dimers. In contrast, Cu(I) iodide under the same conditions gave the thione-free dimeric compound [CuI(dppet)]2 which contains double-bridging I atoms. A notable exception was for the reaction with 5-methyl-1,3,4-thiadiazole-2-thione (mtdztH) which, under the same conditions, gave rise to the unexpected, simultaneous formation of the monomer [CuI(dppet)(MeCN)] as well as the above mentioned dimeric [CuI(dppet)]2. Also treatment [CuX(dppet)(L)] with two equivalent of PPh3 was found to cause replacement of the diphos ligand, while substitution of the Cl atom under HCl elimination and formation of [Cu(dppet)(mftztH)2] occurred in the unique case of treating [CuCl(dppet)(mftztH)] with one addnl. equivalent of the same thione ligand. The structures of one representative for each of the above mentioned types of complexes, [CuBr(dppet)(mftztH)], [Cu(dppet)(mftztH)2], [Cu(μ-I)(dppet)]2·[CuI(dppet)(MeCN)] and [CuBr{μ-S(pymtH)}(pymtH)]2 were established by single-crystal x-ray diffraction.
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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem