Synthesis and detailed NMR study of tricarbonylrhenium(I) and trimethylplatinum(IV) halide complexes of 2-methylthiomethyl-4-(S)-methyl-1,3-oxazoline (L). X-ray crystal structure of fac-[ReBr(CO)3L]

Author(s): Heard Peter J. | Tocher Derek A.

Type of publication: Journal paper

Abstract: 2-Methylthiomethyl-4-(S)-methyl-1,3-oxazoline (L) reacts with the halogenopentacarbonylrhenium(I) and halgenotrimethylplatinum(IV) metal moieties, to form complexes of general formulae fac-[ReX(CO)3L] and fac-[PtXMe3L] (X = Cl, Br or I) in good yield. Detailed NMR studies reveal the presence of four solution-state diasteroisomers, which differ according to the orientation of the SMe and oxazole-methyl groups with respect to the halogen. Above ambient temperature, inversion at the S atom causes the epimerisation of pairs of diastereoisomers. The energetics of S inversion in the complexes [ReX(CO)3L](X = Cl, Br or I) were measured by standard 1H band shape analysis of the variable temperature spectra; energy barriers, ΔG‡ (298 K), are in the range 67–70 kJ mol−1. Atropisomerisation occurs over a period of several hours at ca. 350 K, and several weeks at ca. 273 K. Platinum-195 NMR data are reported for the complexes [PtXMe3L](X = Cl, Br or I).

Published URL: https://www.sciencedirect.com/science/article/pii/S0022328X97005305

Date Published: December 18 1997

Publication title: Journal of Organometallic Chemistry

Publisher: Elsevier

Place of publication: London

Pages: 295-304

Subject(s): Chemistry | Organometallic Chemistry

DOI: https://doi.org/10.1016/S0022-328X(97)00530-5

Keywords: Halogenopentacarbonylrhenium metal moiety | Halgenotrimethylplatinum(IV) metal moiety | NMR studies

Depositing User: Hasnah Patel