DETERMINATION OF ABSOLUTE CONFIGURATION OF 8,8,10,10TETRACHLORO-20,21-DIHYDRO-18H,23H-6,12-EPIAZENO-6λ5,8λ5,10λ5, 12λ5[1,3,2]BENZOXAZAPHOSPHONINO[2`,3`:8,9][1,3,5,7,9,2,4,6,8] PENTAAZATETRAPHOSPHACYCLOUNDSYNO[2,1-B][1,3,2] BENZOXAZAPHOSPHONINE USING X-RAY CRYSTALLOGRAPHY

Authors : Gamze ELMAS, Aytuğ OKUMUŞ, Satiye Sevim İSAOĞLU, Tuncer HÖKELEK, Zeynel KILIÇ

Pages : 1-14

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Publication Date : 2019-12-31

Article Type : Research Paper

Abstract :The title compound, 8, 8, 10, 10-tetrachloro-20,21-dihydro-18H, 23H-6, 12epiazeno-6λ5, 8λ5, 10λ5, 12λ5-[1,3,2] benzoxazaphosphonino [2`,3`:8,9][1,3,5,7,9,2,4,6,8] pentaazatetraphosphacyclo undsyno [2,1-b] [1,3,2] benzoxazaphosphonine; C16H16Cl4N6O2P4, a cyclotetraphosphazene, has a tetrachloro-2, 4-spiro-ansa-spiro insert ignore into journalissuearticles values(tetrachloro-2,4-sas); architecture in which the bicyclic structure has consisted of eightmembered tetrameric N4P4 and seven-membered ansa insert ignore into journalissuearticles values(N1/P1/P1′/N4′/C8′/C8/N4); rings fused with a common PNP fragment. The asymmetric unit possesses one-half of the molecule. P1 and P1′ atoms are stereogenic centres. In addition, there is a mirror plane passing through the N3 and N1 atoms in the molecule, and therefore, this compound is in meso form insert ignore into journalissuearticles values(RS/SR);. According to the checkcif result, it is found that the absolute configuration of P1 and/or P1′ phosphorus centers is RS, displaying that in the solid-state there is only one enantiomer in the unit cell. The space group is P bnm with cell parameters of a = 6.2692insert ignore into journalissuearticles values(2);, b = 15.8111insert ignore into journalissuearticles values(3);, c = 22.9393insert ignore into journalissuearticles values(4); Å.
Keywords : Cyclotetraphosphazene, spiro ansa spiro Structure, X ray crystallography