{HEAD ~ A borohydride}, as e.g. an alkaline earth metal or {TAIL ~ preferably an alkaline metal borohydride}, such as potassium or sodium borohydride, is the least preferred reducing agent 
as
{ HEAD ~ A borohydride } , as e.g. an alkaline earth metal or { TAIL ~ preferably an alkaline metal borohydride } , such as potassium or sodium borohydride , is the least preferred reducing agent
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH