Abstract Several routes to 1-halo 2-trimethylsilyl ethylenes have been previously proposed 1- 6: from ethyn7yltrimethylilane (addition of HBr1, 2), ethyltrichlorosilane (addition H by C1, followed by dehydrohalogenation and further methylation of th Si-C1 bonds) 3 or by other ways 4, 5, especially by reaction of (2-trimethylsilyl) vinyl lithium with dibromoethane6.