On the synthesis of geometric isomers of 2??methyl (or phenyl)??4??[α??arylethylidene]??5 (4H)??oxazolones

~41%

~20%

~16%

~51%

~0%

~%

~17%

~47%

~48%

~85%

~0%

~%

~%

~%

~36%

~30%