... RCNHC H2C H2X -- NHzCHzCHzX la, X= RCOS or RCOz 2,X=RO,ArO,RS. or HS b,X=RO.ArO.RS,or HS In our continuing study of oxazoline chemistry we have investigated the ring opening of oxazolines by primary and 0 ... Page 2. 4890 J. Org. Chem., Vol. 49, No. 25, 1984 ...