ePrints

Alkali Metal-Mediated Schlenk Dimerization of a Phosphorus-Substituted Alkene. Synthesis and Crystal Structures of Li, Na, and K Derivatives of a Phosphorus-Stabilized Butane-l,4-diide Ligand

Lookup NU author(s): Dr Keith IzodORCiD, Emeritus Professor William McFarlane, Brent Tyson, Professor William Clegg, Dr Ross Harrington, Dr Stephen Liddle

Downloads

Full text for this publication is not currently held within this repository. Alternative links are provided below where available.

Abstract

Treatment of the vinylidene phosphine (Ph2P) 2C=CH2 (1) with either Li or Na in THF yields the bis(diphosphinomethanide) complexes {(THF)2Li(Ph2P) 2CCH2}2 (2), {(pmdeta)2Li(Ph2P) 2CCH2}2·(PhMe)3 (6), and [{(tmeda) 1.5Na(Ph2P)2CCH2}2]n (3b), after recrystallization [tmeda = N,N,N′,N′-tetramethylethylenediamine, pmdeta = N,N,N′,N′,N′-pentamethyldiethylenetriamine]. Treatment of 1 with K under the same conditions results in ligand degradation to give K(PPh2), which was isolated as the adduct {(pmdeta)K(PPh 2)}n (4) after recrystallization from toluene/pmdeta, and unidentified organopotassium products. The potassium bis(diphosphinomethanide) [{(Ph2P)2CCH2CH2C(PPh 2)2}2K4(pmdeta)(DME)3· (PhMe) 2]n (5) may be accessed via a metathesis reaction between 2 and KO-t-Bu in ether, followed by recrystallization from toluene/DME in the presence of pmdeta [DME = 1,2dimethoxyethane]. Compounds 3b, 4, 5, and 6 have been characterized by multielement NMR spectroscopy and X-ray crystallography.

Publication metadata

Author(s): Izod K, McFarlane W, Tyson BV, Clegg W, Harrington RW, Liddle ST

Publication type: Article

Publication status: Published

Journal: Organometallics

Year: 2003

Volume: 22

Issue: 18

Pages: 3684-3690

ISSN (print): 0276-7333

ISSN (electronic): 1520-6041

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/om030393l

DOI: 10.1021/om030393l

Altmetrics

Share