In particular, for example, a benzyl or methoxymethyl group is used as the protective group and {HEAD ~ a Grignard reagent} is used as {TAIL ~ the organometallic reagent} 
is used as
In particular , for example , a benzyl or methoxymethyl group is used as the protective group and { HEAD ~ a Grignard reagent } is used as { TAIL ~ the organometallic reagent }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL