Interaction of aminals of conjugated ?-dimethylaminoaldehydes with cyclic ?-dicarbonyl compounds
摘要:
Reactions of animals of conjugated omega-dimethylaminoaldehydes with Meldrum's acid, N,N'-(o-phenylene)malonamides, and 2,3-dihydrophenalene-1,3-dione afford delta-dimethylaminodienones, substituted 2-dimethylamino-2H-pyrans, or oxanine salts. Cation-anionic polymethine dyes have been obtained from the latter.