the Darzens glycidic ester synthesis for converting unsaturated ketones or aldehydes into the homologated β,γ- or α,β-unsaturatedaldehydes employing sulfur ylides is described. The carbonyl group is converted into the unsaturated oxirane which is then rearranged to the new aldehyde. High yields of isomerically pure aldehydes are available by this method and the process is of practical importance in
The new compound trimethyl sulphonium borohydride has been prepared. It decomposes above 90° to methane and the co-ordination compound dimethyl sulphide-borine.