Summary The 1-magnesia-1-zincaalkene 4 and the 1-lithia-1-zincaalkene 15, easily obtained by a carbometallation reaction, are able to react successively with two different electrophiles to give good yields of various gem-difunctionalized compounds like the α- deuterated-and α-iodo-stannanes 7b-c and the α-allylated thioesters 10a-b. This demonstrates the usefulness of compounds of type 4 and 15 as multi-coupling reagents. A ...
