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! ntroductionReaction of PhPCI 2 with o-HOC6H4COCH 3 gives an unusual tricyclic tetraoxaphosphaundecane. Crystals of this compound are monoclinic, P2~/c, with a = 13.874(7), b = 7.924 (4), c = 16.572 (8) A, fl = 94.5 (2) °, Z = 4. The geometry around the P atom is distorted trigonal bipyramidal, with the two fivemembered rings and one six-membered ring all in apical-equatorial positions. It is postulated that permutational isomerization in solution is unlikely for this compound partly because of its molectflar rigidity. Crystals of the disubstituted phosphinic acid formed as its hydrolysis product are monoclinic, P2Jn, with a = 13.886 (7), b = 7.378 (4), c = 15.280(8) A, fl = 116.9 (2) °, Z = 4. The P atom has the expected tetrahedral environment. O--.O close contacts <2.76 A indicate hydrogen bonding which extends throughout the lattice.0567-7408/79/122995-05501.00