Interaction of aminals of conjugated ?-dimethylaminoaldehydes with cyclic ?-dicarbonyl compounds
                                
                                    
                                        作者:Zh. A. Krasnaya、E. V. Grechkina、V. S. Bogdanov                                    
                                    
                                        DOI:10.1007/bf00695825
                                    
                                    
                                        日期:1994.2
                                    
                                    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.