Chemistry is the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics, SDS of cas: 367-11-3, 367-11-3, Name is 1,2-Difluorobenzene, SMILES is FC1=CC=CC=C1F, belongs to benzoxazole compound. In a document, author is Wu, Chia-Hua, introduce the new discover.
Excited-state proton transfer relieves antiaromaticity in molecules
Baird’s rule explains why and when excited-state proton transfer (ESPT) reactions happen in organic compounds. Bifunctional compounds that are [4n + 2] pi-aromatic in the ground state, become [4n + 2] pi-antiaromatic in the first (1)pi pi* states, and proton transfer (either inter- or intramolecularly) helps relieve excited-state antiaromaticity. Computed nucleus-independent chemical shifts (NICS) for several ESPT examples (including excited-state intramolecular proton transfers (ESIPT), biprotonic transfers, dynamic catalyzed transfers, and proton relay transfers) document the important role of excited-state antiaromaticity. o-Salicylic acid undergoes ESPT only in the antiaromatic S-1 ((1)pi pi*) state, but not in the aromatic S-2 ((1)pi pi*) state. Stokes’ shifts of structurally related compounds [e.g., derivatives of 2-(2-hydroxyphenyl)benzoxazole and hydrogen-bonded complexes of 2-aminopyridine with protic substrates] vary depending on the antiaromaticity of the photoinduced tautomers. Remarkably, Baird’s rule predicts the effect of light on hydrogen bond strengths; hydrogen bonds that enhance (and reduce) excited-state antiaromaticity in compounds become weakened (and strengthened) upon photoexcitation.
A reaction mechanism is the microscopic path by which reactants are transformed into products. Each step is an elementary reaction. In my other articles, you can also check out more blogs about 367-11-3. SDS of cas: 367-11-3.
Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem