Rajendra D. Sharma, S. Rettig, N. Paddock
Feb 15, 1982
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0
Influential Citations
7
Citations
Journal
Canadian Journal of Chemistry
Abstract
1-Methylpyrroles, in which the 2-position is occupied by a pentafluorocyclotriphosphazenyl (1a), heptafluorocyclotetraphosphazenyl (1b), nonafluorocyclopentaphosphazenyl (1c), or undecafluorocyclohexaphosphazenyl group (1d), have been prepared from 2-lithio-1-methylpyrrole and the corresponding fluorophosphazene. Crystals of 1b are monoclinic, a = 17.300(2), b = 5.0281(3), c = 16.902(2) A, β = 108.904(4)°, Z = 4, space group P2/n. The structure was solved by direct methods and was refined by full-matrix least-squares procedures to R = 0.038 and Rw = 0.047 for 1167 observed reflections. The N4P4 ring is nearly planar. The P—N bond lengths (corrected for libration) range from 1.524(5) to 1.562(5) A with a mean value of 1.541(17) A, and the mean ring angles are 122.9(20)° at phosphorus and 146.4(23)° at nitrogen. The geometry of the 1-methylpyrryl group shows no unexpected features, but the P—C bond (1.756(5) A) is significantly shorter than in typical P-phenyl derivatives, and the P—F bond at the same atom ...