,3,4-TETRACHLORO-1,5,2,4-DIAZADIPHOSPHORINAN-6-ONE AND SOME DERIVATIVES .2.

The title compound 1 was allowed to react with catechol 2,3-dihydroxyn aphthalene, tetrabromocatechol, resorcinol, saligenin, and 3,5-di-tert -butylcatechol in the presence of triethylamine to form compounds 4a-4 d and 4f. Whereas the catechol derivative 4a, the naphthol derivative 4b, and the tetrabromocatechol derivative 4c could be readily obtained , the saligenin derivative 4d and the 3,5-di-tert-butylcatechol deriva tive 4f were found to be stable only in solution. Contrary to expectat ion, compound 4e was not formed in the reaction of 1 with resorcinol. The reaction of 1 with 1,2,4,5-tetrahydroxybenzene led to the pentacyc lic derivative 4g. Reaction of hydroquinone with 1 led to the formatio n of the polycyclic structure 4h. Crystal structure analyses of 4a and 4b show that the nine-membered rings adopt essentially identical ''tu b'' conformations in which the P and O atoms are coplanar. The P-C-P a ngles (across the CCl2 bridge) are wide (ca. 119 degrees). (C) 1997 Jo hn Wiley & Sons, Inc.