Hydrogen/deuterium exchange in alkyl-hydride derivatives of ansa-tungstenocene compounds

Green, Malcolm L.H.; Conway, Stephen L.J. and Doerrer, Linda H. (2005). Hydrogen/deuterium exchange in alkyl-hydride derivatives of ansa-tungstenocene compounds. Polyhedron, 24(11) pp. 1388–1403.

DOI: https://doi.org/10.1016/j.poly.2005.05.004

Abstract

The higher n-alkyl hydrides [W{(η-C₅H₄)CMe₂(η-C₅H₄)}(R)H](R = {(CH₂)_nCH₃}, n = 1–4) and the isotopically labelled analogues [W(η-C₅D₄)C(CD₃)₂(η-C₅D₄)}(R)D], (R = {(CH₂)_nCH₃} (n = 1–4) and [W{(η-C₅H₄)CMe₂(η-C₅H₄)}{CD₂CD₃}H] have been prepared and the hydrogen/deuterium exchange processes under thermal conditions in these compounds have been investigated by NMR spectroscopy. In every case of all the possible alkyl hydrogens of the alkyl groups R only H/D exchange with the α-CH₂ methylene hydrogens was observed.

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