Mononuclear η2 (4e)-Bonded Phosphaalkyne Complexes; Selective Formation of a 1,2-Diphosphacyclobutadiene Tantalum Complex

Andrew D Burrows; Alk Dransfeld; Michael Green; John C Jeffery; Cameron Jones; Jason M Lynam; Minh T Nguyen

doi:10.1002/1521-3773(20010903)40:17<3221::AID-ANIE3221>3.0.CO;2-V

Mononuclear η² (4e)-Bonded Phosphaalkyne Complexes; Selective Formation of a 1,2-Diphosphacyclobutadiene Tantalum Complex

Angew Chem Int Ed Engl. 2001 Sep 3;40(17):3221-3224. doi: 10.1002/1521-3773(20010903)40:17<3221::AID-ANIE3221>3.0.CO;2-V.

Authors

Andrew D Burrows¹, Alk Dransfeld², Michael Green³, John C Jeffery³, Cameron Jones⁴, Jason M Lynam³, Minh T Nguyen²

Affiliations

¹ Department of Chemistry, University of Bath Bath, BA2 7AY (UK).
² Department of Chemistry, University of Leuven Celestijueleua 200F, 3001 Leuven (Belgium) Fax: (+32) 16-32-79-92.
³ School of Chemistry University of Bristol Bristol, BS8 1TS (UK) Fax: (+44) 117-929-0509.
⁴ Department of Chemistry, University of Wales at Cardiff PO Box 912, Cardiff, CF1 3TB (UK).

PMID: 29712066
DOI: 10.1002/1521-3773(20010903)40:17<3221::AID-ANIE3221>3.0.CO;2-V

Abstract

Only the 1,2-diphosphacyclobutadiene and none of its 1,3 isomer was obtained in the reaction of 1 with tBuC≡P to give 2. In complex 1, which was prepared from [TaCl₂ (η⁵ -C₅ Me₅ )(CO)₂ (thf)] and tBuC≡P, the phosphaalkyne adopts an η² (4e) bonding mode according to NMR data, crystal structure analysis, and theoretical calculations.

Keywords: density functional calculations; phosphaalkynes; phosphorus heterocycles; tantalum.