Wolfgang Kliegel

Crystal and molecular structure of diphenylboron N-methylacethydroxamate (4,5-dimethyl-2,2-diphenyl-1,3-dioxa-4-azonia-2-boratacyclopent-4-ene)

Crystals of diphenylboron N-methylacethydroxamate are orthorhombic, a = 12.5478(8), b = 7.8735(3), c = 13.6809(5) A, Z = 4, space group Pnam. The structure was solved by direct methods and was refined by full-matrix least-squares procedures to R = 0.037 and Rw = 0.054 for 1265 reflections with I ≥ 3σ(I). The molecule features a five-membered BO2CN ring which lies in the crystallographic mirror plane. The carbon and nitrogen atoms of the heterocyclic ring are positionally disordered. Mean bond lengths (corrected for libration) are: O—B, 1.550(2), B—C, 1.609(2), O—C/N, 1.340(3), C—N, 1.300(2), C/N—CH, 1.470(2), and C—C(phenyl), 1.394(8) A.

Tri­phenyl­boroxin complex with N-cyclo­hexyl­hydroxy­lamine and its isobutyr­aldehyde nitro­ne

# 2002 International Union of Crystallography Printed in Great Britain ± all rights reserved N-Cyclohexylhydroxylamine(O±B)triphenylboroxin N-cyclohexyl-C-(2-propyl)nitrone hemibenzene hemisolvate, C24H28B3NO4.C10H19NO 0.5C6H6, contains one molecule of Ncyclohexylhydroxylamine in its N-oxide form added to a boroxin heterocycle, with one molecule of N-cyclohexyl-C-(2propyl)nitrone linked by an O HÐN hydrogen bond to the protonated hydroxylamine moiety, and a molecule of benzene which is located on a centre of inversion.