2-PHENYLPHTHALIMIDINE DERIVATIVES - A PROBABLE FORMATION MECHANISM OF ADDUCTS FROM 3-BENZYLIDENEPHTHALIDE AND ANILINE

3-Benzyl-3-hydroxy-2-phenylphthalimidine (1) and 3-anilino-3-benzyl-2-phenylphthalimidine (2), the unusual adduct, are obtained from the title compounds. 3-Alkoxy-3-benzyl-2-phenylphthalimidines 3 are synthesized. The behavior of 1, 3-benzylidene-2-phenylphthalimidines (4 and 5), 3-(.alpha.-bromobenzylidene)-2-phenylphthalimidines (6 and 7) with respect to bases and the preparation of the open tautomer 13 of 1 and its hydrochloride are described. A hypothetical mechanism about the formation of 1 and 2 is suggested.