Electrophilic substitutions of polymethinium salts

J Kučera, Z Arnold

文献索引：Kucera,J.; Arnold,Z. Collection of Czechoslovak Chemical Communications, 1967 , vol. 32, # 5 p. 1704 - 1711

全文：HTML全文

被引用次数: 42

摘要

Nitration~ nd bromination of some trimethinium salts and a pentamethinium salt has been studied along with ultraviolet spectra of the products obtained. Structure of the nitro derivatives has been established by cyclisation to heterocyclic compounds. In ultraviolet spectra of some 2-substituted trimethinium salts, a shift of absorption maxima to longer wave- lengths occurs which is probably due to a steric effect.