Effect of Phenyl Substitution on Bonding in η3-Benzyl Complexes of Platinum

DOI: 10.1039/DT9950002391

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 2391 - 2396 (1995)

Update date:2022-07-30

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Authors:

Crascall, Louise E.

Spencer, John L.

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Article abstract of DOI:10.1039/DT9950002391

Reaction of the platinum(0) styrene complexes 2-CH2=CHC6H4X)<(t-Bu)2P(CH2)3P(t-Bu)2>> 1a-1f (X = Br-3, Br-4, Me-4, F-4, F-3 or MeO-4) with HBF4 in diethyl ether afforded the η³-methylbenzyl complexes 3-MeCHC6H4X)<(t-Bu)2P(CH2)3P(t-Bu)2>> 2a-2f.The effect of phenyl substitution on the asymmetry of the η³-methylbenzyl interaction was measured by 31P-<1H> NMR spectroscopy and it was found that, in general, the more electron releasing the substituent, X, the more asymmetric is the bonding.Complexes 2a-2f lose styrene reversibly to form the hydride-bridged dinuclear platinum complex 2>2.Displacement of styrenes from 2a-2f by ethene and bicyclo<2.2.1>hept-2-ene affords known complexes stabilized by a three-centre, two-electron (agostic) bond.

Full text of DOI:10.1039/DT9950002391

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