The olefinic products arising from he oxidative addition at ambient temperatures of 2,2,6,6-tetramethyl-cyclohex-1-yl toluene-p-sulphonate to (PPh3)2CoBr2,(PPh3)2NiBr2, and hydroxo-cobalamin, all reduced with sodium borohydride, or to (Me)2CuLi, provide firm evidence for a novel mechanism of the 1,2-bond shift rearrangements catalysed by vitamin B12 coenzyme.
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