Organomercurials, which were generated by intra-and inter-molecular me
rcury(II)-promoted electrophilic additions, have been reductively deme
rcurated in situ efficiently using sodium borohydride in the presence
of triethylborane at low temperature. Under these conditions, the freq
uently accompanying side reactions such as reductive elimination and o
xidative demercuration have not been detected. (C) 1997 Elsevier Scien
ce Ltd. All rights reserved.