?-Arylamino-cyanomethylen-pyrazolinone aus Azomethinfarbstoffen und Malons�uredinitril
                                
                                    
                                        作者:L. Hennig、G. Mann、C. Schellenberg、K. Franke                                    
                                    
                                        DOI:10.1002/prac.19933350411
                                    
                                    
                                        日期:——
                                    
                                    The reaction of azomethine dyes (1a - g) with malonodinitrile (2) gives dicyanomethylene-pyrazolin-5-one (4) which immediately reacts with the eliminated anilines by HCN-amine exchange giving the deeply coloured arylamino-cyanomethylene-pyrazolinones (5a-g). Structural investigations and a study of the absorption characteristic are described.