SYNTHESIS AND X-RAY CRYSTALLOGRAPHIC CHARACTERIZATION OF SPIRO ORTHOCARBONATES

In this study we have synthesized two spiro orthocarbonates, which can be polymerized with volume expansion, and determined their crystal structures. The crystal data are as follows; 3,4,10,11-Di(9,10-dihydro-9,10-ethanoanthracenyl)-1,6,8,13-tetraoxa-6.6-tridecane 5: a=16.898 (1), b=9.299 (1), c=24.359 (2) angstrom, beta= 123.73 (7)-degrees, space group P2 square-root c and R=0.073 for 2954 reflections; compound 8: a=15.244 (4), b=15.293 (3), c=10.772 (3) angstrom, beta=99.45 (2)-degrees space group P2 square-root c and R=0.082 for 2346 reflections. The seven-membered rings of compound 5 are chair forms and all the six-membered rings are boat shaped. For a six-membered spiro orthocarbonate, 3,9-Di(9-fluorenylidenyl)-1,4,6,9-tetraoxa-5,5-undecane 8, fluorene groups EC(l) atom through C(13) atom] are planar within +/- 0.09 angstrom and the six-membered rings have chair conformations. The whole molecule has pseudo-C2 symmetry. The water molecules in the crystal are linked with each other through the hydrogen bond with distance of 2.790 (20) angstrom.