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