Synthese und Struktur von l,2-Bis(organozinn-boryl)ethen-Derivaten / Synthesis and Structure of l,2-Bis(organotin-boryl)ethene Derivatives

Abstract

Trimethyltinlithium reacts with z-1,2-bis(diisopropylamino-chloro-boryl)ethene derivatives 4a (R = Et) and 4b (R = H) to give the cis-1,2-bis(diisopropylamino-trimethyltin-boryl)- hexene-3 (2a) and, surprisingly, the trans-1,2-bis(diisopropylamino-trimethyltin-boryl)- ethene (5 b) respectively. The constitution of 2 a and 5 b is derived from spectroscopic data, and confirmed by X-ray structure analyses. The formation of the trans-product 5 b probably occurs via a radial intermediate.