... Hein, Case Institute of Tech- nology, 1838. (2) P. Kovacic and R. W. Hein, THIS JOURNAL, 81, 1187 (1989). (3) P. Kovacic. US Patent 2,818,405 (1957); C. A., 52, 8018 (ll(58). Results The dinlaleiinides (I), dimaleamic acids (11) and A'-phenylmaleimide were synthesized accord- ing to the method of Searle4 and are described in a preceding publication. HC-CO HCCOh-HRNHCOCH HC-CO HCC02H H02CCH I1 I! ...