S. Pipko, Ludmila V. Bezgubenko, A. Sinitsa
Mar 1, 2008
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Journal
Heteroatom Chemistry
Abstract
Complexes of phosphorus pentachloride with 4-dimethylaminopyridine and N-methylimidazole were synthesized. The molecular structure of the phosphorus pentachloride complex with N-methylimidazole was determined by single-crystal X-ray diffraction. In the cationic part of the complex, the phosphorus atom possesses four PCl bonds within the range 2.109–2.148 A and two cis-P–N bonds (1.811 and 1.832 A) with N-methylimidazole and exhibits slightly distorted octahedral coordination with angles at phosphorus atom in the range 87.57°–91.50°. The relative stability of the cis and trans conformations of the complex was studied by DFT calculations. The chemical properties and reactivity of the compounds obtained are determined; their utility as condensing agents in the synthesis of amides from acids and amines was shown. © 2008 Wiley Periodicals, Inc. Heteroatom Chem 19:171–177, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20392