Abstract
The synthesis of E-alkenylstannanes from aldehydes and a mixture of Bu 3SnCHBr 2, LiI and CrCl 2 is described. A mechanism is proposed to account for the alkene geometry in chromium(II)-mediated alkene synthesis which involves stereoselective addition by a gem-dichromium reagent to an aldehyde followed by a stereospecific elimination step.
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