The 13C nmr spectra of the title compounds are reported. Chemical shifts of C‐4 and C‐5 carbons of the triazole ring are used for structural assignment of the 4,5‐unsymmetrically substituted 1‐(α‐aroyloxyarylideneamino)‐v‐triazoles (triazolylisoimides). A complete assignment of the shifts of the α‐aroyloxyarylideneamino group is given. Some JC‐H values are also reported.
Twenty four 2‐Aryl‐Δ‐2‐1,3,4‐oxadiazoline‐5‐thione derivatives 2 were synthesized and their uv and ir spectra were studied. Correlation between σ‐Hammett constants of aryl substituents and the differences in absorption maxima (Δv = v1‐v2 in kK) of the electronic spectra of the deprotonated species were also evaluated. A new method for the synthesis of the 2‐(amino)aryl derivatives 2v,w,x is also reported.
Diethyl 1,2-benzoxaphosphorine-3-carboxylates 5 undergo a regio- and stereoselective [2+2] photodimerization reaction in methanol solution under the action of sunlight, giving in all cases the corresponding anti head-to-tail dimers 6 and 7. Concerning the stereogenic P atom, the photodimerization is also stereoselective, and the centrosymmetric stereoisomer 6 predominates over the non symmetric P-epimer 7.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.