In {TAIL ~ place} of {HEAD ~ the aldehyde} there can also be used a suitable acetal, e.g. the dimethyl acetal 
In { TAIL ~ place } of { HEAD ~ the aldehyde } there can also be used a suitable acetal , e.g. the dimethyl acetal
OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH