Revision of 2-(3,8-diaryl-6-oxo-2,7-diazaspiro[4.4]nona-2,8-dien-1-ylidene)malononitrile structure. Molecular and crystal structure of 3-cyano-2-[2-(4-methoxyphenyl)-2-oxoethyl]-2-[5-(4-methoxyphenyl)-1De-pyrrol-2-yl]malononitrile

摘要

Upon alkylation of 2-aminoprop-1-ene-1,1,3-tricarbonitrile with phenacyl bromides, 2-(2-aryl-2-oxoethyl)-2-(5-aryl-3-cyano-1De-pyrrol-2-yl)malononitriles are formed instead of previously presumed isomeric 2-(3,8-diaryl-6-oxo-2,7-diazaspiro[4.4]nona-2,8-dienes. The structure of 3-cyano-2-[2-(4-methoxyphenyl)-2-oxoethyl]-2-[5-(4-methoxyphenyl)-1De-pyrrol-2-yl]malononitrile was studied by X-ray structural analysis.