Transition-metal Complexes of Di- and Tri-phosphines derived from 1,1-Bis(diphenylphosphinomethyl)ethene

DOI: 10.1039/DT9930003567

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 3567 - 3574 (1993)

Update date:2022-08-05

Topics:

Authors:

Bookham, Jonathan L.

Clegg, William

McFarlane, William

Raper, Eric S.

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Article abstract of DOI:10.1039/DT9930003567

Base-catalysed rearrangements of and/or additions of PPh2H to > (M = Cr 1a, Mo 1b or W 1c) lead to cis-> 2a-2c and to fac-> 3b, 3c.The structures of 1b, 2b and 3b have been determined by single-crystal X-ray diffraction.Marked differences are seen in the chelate-ring conformations of 1b with an exocyclic C=C bond, 2b with an endocyclic bond, and cis-Ph2P(CH2)3PPh2>> with no C=C bond.Proton, 13C and 31P NMR data for 3b and 3c were obtained and a two-dimensional rotating frame nuclear Overhauser experiment was used to identify anisochronous methylene resonances in the proton NMR spectrum of 3b thus confirming a dependence of ³J(PH) on dihedral angle in these rigid polycylic systems.

Full text of DOI:10.1039/DT9930003567

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