Abstract
6,8-dinitro-2,4-bis(trichloromethyl)-1,3-benzdioxin is monoclinic,P21/c,Z=4,a=12.348(2),b=11.575(3),c=12.183(4) A,β=107.48(2)°. The structure was solved by direct methods, from data collected at room temperature on an Enraf-Nonius CAD4 diffractometer, and refined by least-squares to a finalR value of 0.032 using 2192 reflections. The heterocyclic ring is an envelope structure, the dihedral angle between the plane of the aromatic ring and that containing five of the atoms of the heterocycle being 4.98(6)°. One -CCl3 group is pseudoequatorial while the (Ar-C)CCl3 group is pseudoaxial. C-Ceq 1.526(3) A; C-Cax 1.537(3) A; C-C(Cax)-O 112.4(2)°; C(Cax)-O-C(Ceq) 115.2(2)°.
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