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article
2-Chloro-1,3,2-diazaphospholenes - a crystal structural study
Abstract
"A series of 2-chloro-1,3,2-diazaphospholenes with different substitution patterns has been prepared from 1,4-diazabutadienes according to a general synthetic methodology. Subsequent chloride abstraction with Lewis acids affords the corresponding 1,3,2-diazaphospholenium salts. All products have been characterised spectroscopically and by single-crystal X-ray diffraction studies. A detailed analysis of trends in the structural parameters supports the interpretation that the unusual P-Cl bond lengthening in the diazaphospholenes is attributable to n(N)/sigma*(P-Cl) hyperconjugation. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)."