Chiral Organometallic Reagents, III. On the Configurational Stability of α‐Bromoalkyllithium Compounds

The carbenoids 2 undergo at ‐110°C a bromine/lithium exchange reaction with 1,1‐dibromo alkanes. This leads to partial equilibration of the carbenoids 2 during their generation from the 1,1‐dibromo compound 1. In the absence of the precursor 1, the carbenoids 2 have been found to be configurationally stable at ‐110°C.