Cycloadditions-Eliminierungsreaktionen von Phenylisocyanat mit Oxo-und Thionoderivaten aliphatisch substituierter 5-Imino-1,2,4-dithiazolidine und 3-Thiono-1,2,4-thiadiazolidine (Senf�loxide und Senf�lsulfide)
                                
                                    
                                        作者:Franz Tittelbach、A. Schellhaas                                    
                                    
                                        DOI:10.1002/prac.19923340808
                                    
                                    
                                        日期:——
                                    
                                    5-Imino-1,2,4-dithiazolidin-3-ones 1 and -3-thiones 3 react with phenylisocyanate to afford 5-imino-1,2,4-thiadiazolidin-3-ones 6. In comparison isomeric 3-thiono-1,2,4-thiadiazolidin-5-ones 2, 5, and -5-thiones 4 yield 3-imino-1,2,4-thiadiazolidin-5-ones 8, 10, and -5-thiones 7. Thermolyses of thiadiazolidines 5 and 10 afford further 1,2,4-thiadiazolidines 9, 11. Compounds 8 - 11 are available also by reaction of substituted guanidines with chlorocarbonyl sulfenylchloride.