Single-crystal structure analysis of a novel aryl phosphinate diglycidyl ether

The crystal structure of 10-[2,5-bis(2,3-epoxy-1-propoxy)phenyl]-9-oxa-10-phosphaphenanthren-10-one has been studied by single-crystal X-ray diffraction. The unit cell of C24H21O6P, M-r = 436.4, is triclinic, P (1) over bar, with a = 8.507 (3), b = 10.613 (4), c = 12.457 (3) Angstrom, alpha = 80.05 (3), beta = 71.38 (2), gamma = 76.69 (3)degrees, V = 1031.1 (6) Angstrom(3), Z = 2, D-x = 1.406 Mg m(-3) and mu(Mo K alpha) = 0.17 mm(-1) The final R (wR) is 0.063 (0.057) {w = 1/[sigma(2)(F) + 0.0004F(2)]} for 3619 unique reflections measured at 295 K. The aryl phosphinate group bonded to the central phenyl ring comes close to one of the two glycidyl ether groups, the epoxide ring of which is ordered. The epoxide ring far from the aryl phosphinate group is disordered. The NMR chemical shifts of the protons of the glycidyl ether group close to the aryl phosphinate group are reduced by the 'ring-current effect'.