Theoretical (B3LYP/6-31G*) and experimental (NMR, UV, and IR spectroscopy) data on the electronic and steric structure of 2-(2-benzoyl-1- phenylethenyl)-5-phenylpyrrole have been analyzed in the context of the hypothesis of the zwitter ionic nature of its ground state. The molecule involves a strong NH...O bond, and its ground state can be described as a hybrid of the neutral and zwitter ionic canonical forms; this conclusion was confirmed by the observation of a reversible medium effect on the electronic absorption spectrum of the substrate.
A new convenient method to obtain pyrroles from tertiary n-allylthioamides
作者:Igor V Magedov、Alexander V Kornienko、Tatyana O Zotova、Victor N Drozd
DOI:10.1016/0040-4039(95)00800-r
日期:1995.6
1,2-Disubstituted pyrroles 1 were synthesized from available thioamides 4. Thioamides were initially treated with either alkylating agents or Lewis acids to give salts 5 or complexes 12 which were subsequently reacted with base to yield pyrroles 1.
TROFIMOV B. A.; MIXALEVA A. I.; KOROSTOVA S. E.; SOBENINA L. N.; VASILEV +, ZH. ORGAN. XIMII, 1979, 15, HO 10, 2042-2046
作者:TROFIMOV B. A.、 MIXALEVA A. I.、 KOROSTOVA S. E.、 SOBENINA L. N.、 VASILEV +