In 1958, we reported the course of the Michaeltype addition of maleic hydrazide (111) to activated olefins. Since then, we have investigated these additions with cyclic succinhydrazide (I) and phthalhydrazide (XI), and have found that while XI reacts similarly to 111, the reactions of I differ in some respects from those of 111. While I yielded mono-and diaddition products, 111 and XI afforded only N-substituted monoadducts. This difference ...
