ethyl 3-oxo-5,5-diphenylpent-4-enoate

ethyl 5,5-bis(4-methoxyphenyl)-3-oxopent-4-enoate

ethyl 5,5-bis(4-chlorophenyl)-3-oxopent-4-enoate

4-diazonio-5-ethoxy-5-oxo-1,1-diphenylpenta-1,3-dien-3-olate

4-diazonio-5-ethoxy-1,1-bis(4-methoxyphenyl)-5-oxopenta-1,3-dien-3-olate