Stereoselective formation of malefic acid diester from two diazo acetic acid esters on a Raney nickel surface. Evidence for dipod-chemisorbed carbenes
Abstract
The N2 elimination from diazo acetic acid esters, heterogeneously catalysed by Raney Nickel, yields as chemidesorbed main product up to 93% malefic acid diester, cis-stereoselectivity is observed and additional methyl/ethyl ester crossing experiments provide evidence for dipod-chemisorbed surface carbene intermediates.