Conformation and ligand exchange reactions of trans-[PdCl(C6H4-2-N2Ph)(PR3)2] and related complexes

Anderson, G. K., Cross, R. J., Leaman, S. A., Robertson, F. J., Rycroft, D. S. and Rocamora, M. (1990) Conformation and ligand exchange reactions of trans-[PdCl(C6H4-2-N2Ph)(PR3)2] and related complexes. Journal of Organometallic Chemistry, 388(1–2), pp. 221-231. (doi:10.1016/0022-328X(90)85365-6)

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Abstract

Rotation about the metal—carbon bond in trans-[MCl(C6H4-2-N2Ph)(PMe2Ph)2] (M = Pd, Pt) is slow at 273 K, and phosphine exchange occurs at ambient temperature. Chloride removal from trans-[PdCl(C6H4-2-N2Ph)L2] (L = PMe2Ph, PMe3, PEt3) by silver(I) or methyl trifluoromethanesulfonate is complicated by phosphine abstraction, but reaction of [PdCl(C6H4-2-N2Ph-C,N)L] with AgSO3CF3 in the presence of 2,6-lutidine (2,6-dimethylpyridine) or 2-fluoropyridine produces [Pd(am)(C6H4-2-N2Ph-C,N)L]SO3CF3. Addition of phosphine yields trans-[Pd(am)(C6H4-2-N2Ph)L2]SO3CF3. At or below ambient temperature the 2,6-lutidine complexes exhibit non-equivalent methyl signals in their 1H NMR spectra, and the 2-fluoropyridine species exist as syn and anti isomers. These observations are consistent with slow rotation about the Pd—C and Pd—N bonds in complexes containing PMe3 and PEt3, as well as in those containing PMe2Ph.

Item Type:Articles
Keywords:Organometallic chemistry, NMR spectroscopy.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Rycroft, Dr David
Authors: Anderson, G. K., Cross, R. J., Leaman, S. A., Robertson, F. J., Rycroft, D. S., and Rocamora, M.
Subjects:Q Science > QD Chemistry
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Journal of Organometallic Chemistry
Publisher:Elsevier
ISSN:0022-328X
ISSN (Online):1872-8561

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