“…As for delocalised organozinc nucleophiles such as allyl-and propargylzinc reagents, vinylmagnesium halides are excellent electrophiles 30,31 towards zincated hydrazones and undergo rapid addition to afford gem-Zn-Mg dimetalated hydrazones (Scheme 13). 32 As exemplified in the case of hydrazone 20, the nucleophilic behavior of these adducts is rich.…”