Hydrogen/deuterium exchange in alkyl-hydride derivatives of ansa-tungstenocene compounds
摘要:
The higher n-alkyl hydrides [W{(eta-C5H4)CMe2(eta-C5H4)}(R)H](R = {(CH2)(n)CH3}, n = 1-4) and the isotopically labelled analogues [W(eta-C5D4)C(CD3)(2)(eta-C5D4)}(R)D], (R = {(CH2)(n)CH3} (n = 1-4) and [W{(eta-C5H4)CMe2(eta-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 alpha-CH2 methylene hydrogens was observed. (c) 2005 Elsevier Ltd. All rights reserved.
Hydrogen/deuterium exchange in alkyl-hydride derivatives of ansa-tungstenocene compounds
摘要:
The higher n-alkyl hydrides [W{(eta-C5H4)CMe2(eta-C5H4)}(R)H](R = {(CH2)(n)CH3}, n = 1-4) and the isotopically labelled analogues [W(eta-C5D4)C(CD3)(2)(eta-C5D4)}(R)D], (R = {(CH2)(n)CH3} (n = 1-4) and [W{(eta-C5H4)CMe2(eta-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 alpha-CH2 methylene hydrogens was observed. (c) 2005 Elsevier Ltd. All rights reserved.