... 523 Copyright 0 1983 by Marcel Dekker, Inc. 0039-791 1/83/1306-0523$3.50/0 Page 2. 524 ORSINI AND PELIZZONI The high regioselectivity displayed in the cou pling of t-butyl- l-bromocrotonate prompted us to test the ability of a C-metallated Reformatsky reagent to undergo nucleophilic substitutions with electrophiles ... bromoacetate and we have shmn that it is a C-metalla I f 2 BRZNCH2COOC ( C kj )ij - ted species with a Zn-C bond. ...