The chemistry of 4-thiazolidinones, especially their reaction with hydrazines, has been a subject of a series of publications from this laboratory.'-3 The role of substituents at position- 3 on the mode of cleavage of 3-substituted-2, 4-dioxothiazolidines has been inve~ tigated.~ In alcoholic solution, the 3-alkyl-4-thiazolidones yielded mixtures of pyra~ olinones~~~ and N-alkylhydrazine carboxamide~;~ the route of interconversion into pyrazolinones has ...
