Carbanionic synthons Synthon
comparison between retrosynthetic analysis , chemical synthesis ester alkylation in 1967, e. j. corey introduced concept of synthon in retrosynthetic analysis. planning steps of complex molecule synthesis requires recognizing key synthons , identifying how can assembled desired product. in many retrosynthetic bond disconnections, bond broken heterolytically instead of homolytically, generating carbocationtic , carbanionic synthon. polar-mechanism reactions, whether nucleophilic displacements, 1,2-carbonyl additions, michael reactions, or other processes, involve fusion of nucleophilic fragment , electrophilic fragment. there wide variety of carbanionic synthons available organic chemist construction of complex molecules. these include enolates, organometallics, acetylides, malonates, , carbanions generated in situ after addition olefins. example of carbanionic synthon ester enolate shown in fig. 1. carbon-carbon bond alpha carbonyl can disconnected enolate equivalent , carbon electroph...