A process 2, wherein R1, R2 and R3 are {TAIL ~ hydrogen} and {HEAD ~ R4} is a lower alkyl group 
A process 2 , wherein R1 , R2 and R3 are { TAIL ~ hydrogen } and { HEAD ~ R4 } is a lower alkyl group
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH