Spectroscopic study of the keto-enol equilibrium of N-aryldiacetylthioacetamides and their reactivity
                                
                                    
                                        作者:B. Zaleska、M. M. Burgiel、P. Serda                                    
                                    
                                        DOI:10.1007/s10593-008-0051-3
                                    
                                    
                                        日期:2008.3
                                    
                                    An NMR study of the equilibrium between keto-enol tautomeric forms of N-aryl-diacetylthioacetamides enables us to estimate their population ratio in solvents of increasing polarity. An X-ray analysis confirmed the structure of the thermodynamically most stable tautomer. We presume that the course of heterocyclization processes with N-aryldiacetylthioacetamides is affected by the structure of the reacting tautomeric form. The treatment of N-aryldiacetylthioacetamides with oxalyl or bromoacetyl bromides leads to thiazolidine derivatives. The reactivity of the 5-methylene group in the obtained thiazolidin-4-one derivatives was investigated.