Diazepines, part 29. A comparison between 6-phenyl- and 5,7-diphenyl-2,3-dihydrodiazepinium salts, with comments on the reactivity of 6-phenyldihydrodiazepinium salts towards electrophiles. Crystal and molecular structures of 6-phenyl- and 2,3-cycloh

摘要

Conjugative interaction between a g-phenyl substituent and the vinamidinium system of a dihydrodiazepinium salt appears to be less than that observed with 5- or 7-phenyl substituents; despite this, electrophilic substitution occurs very readily in the 6-phenyl group and comment is made on a possible mechanism. [References: 20]