Synthesis and conformational studies of (diphenylphosphinoamino)-cyclodiphosph(III)azanes

Keat, R., Murray, L. and Rycroft, D. S. (1982) Synthesis and conformational studies of (diphenylphosphinoamino)-cyclodiphosph(III)azanes. Journal of the Chemical Society: Dalton Transactions, 1982(8), pp. 1503-1508. (doi: 10.1039/DT9820001503)

Abstract

A series of 2,4-bis(diphenylphosphinoalkylamino)-1,3-di-t-butylcyclodiphosph(III)azanes, [(Ph₂P)RNPNBu^t]₂ [R = Me or Et (cis- and trans-isomers); R = Prⁱ or Bu^t (cis-isomers)], have been prepared by the reactions of N-lithiated alkyl-N-(diphenylphosphino)amines, N(PPh₂)(R)(Li), with 2-cis-4-dichloro-1,3-di-t-butylcyclodiphosph(III)azane, (ClPNBu^t)₂, in benzene solution. Hydrogen-1, ¹³C, and ³¹P n.m.r. spectroscopy show that these compounds are cyclodiphosph(III)azanes rather than phosph(III)azenes, (Ph₂P)RNP=NBu^t, in solution, and variable temperature ³¹P n.m.r. data have enabled the preferred conformations of the exo-P–N–P skeletons to be identified. In the case of [(Ph₂P)RNPNBu^t]₂ (R = Prⁱ and Bu^t) more than one conformer can be distinguished at sub-ambient temperatures.

• Item Type: Articles
• Keywords: Phosphorus chemistry, NMR spectroscopy.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Rycroft, Dr David
• Authors: Keat, R., Murray, L., and Rycroft, D. S.
• Subjects: Q Science > QD Chemistry
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: Journal of the Chemical Society: Dalton Transactions
• Publisher: Royal Society of Chemistry
• ISSN: 0300-9246