Studies on Selenium-stabilized Carbanions

MisceUaneous Studies on Selenium-stabilized Carbanions.— Generation of the carbanion (54) led to products derived from (55), which is formed by an intramolecular electron-transfer via proton exchange. Selenium appears to 

Stabilize an adjacent carbanion less effectively than sulphur. Some p/iT, values that are relevant to the deprotonation of selenides have been discussed. Base-induced elimination of HBr from /5-bromo-selenides has been reported, and MeSeCHjLi was found not to react satisfactorily with an aldehyde group in a study that led to the synthesis of aphidicolin. 

Introduction.—In this Part, compounds containing the S=N group (which does not always imply that they have typical double-bond character) have been described. The growing interest in the chemistry of these compounds has been shown by several review articles for example, sulphur nitrides (SN) have been extensively 

---