64556-66-7

bp 48–49°C/15 mmHg.

(Z)-2-Bromo-1-(trimethylsilyloxy)ethylene is used essentially as a precursor of (Z)-2-(trimethylsilyloxy)vinyllithium (eq 1).

addition of bromine to trimethylsilyl vinyl ether inCH2Cl2 or Et2Oat?60°C, followed by dehydrobromination with triethylamine (50%)or by reaction of trimethylsilyl 2,2-dibromoethyl ether with two equiv of n-butyllithium in Et2O from ?70°C to rt (86%)(Z/E:95/5).