Solvolysis of ?-Bromo-p-aminostyrene. Mesomeric vinyl cations, Part IV
作者:C. A. Grob、H. R. Pfaendler
DOI:10.1002/hlca.19710540737
日期:1971.11.1
AbstractThe preparation of α‐bromo‐p‐aminostyrene (1b) and its solvolysis rates and products have been reexamined in detail. In buffered 50 vol % aqueous dioxane between pH* 13 and 3 the reaction rate is independent of hydrogen ion concentration. The ratio of the solvolysis products, viz. p‐aminoacetophenone (3b) and p‐aminophenylacetylene (5a), however, varies with the pH* and with the buffer concentration.These findings confirm the unimolecular (SN1‐E1) mechanism involving an intermediate vinyl cation. The acid‐catalysed hydration mechanism proposed by Schubert & Barfknecht is thereby excluded.