Extending the range of stabilised, primary and secondary phosphanes containing ferrocenyl or ruthenocenyl groups
摘要:
Alkylation reactions of FcCH(2)P(CH2OH)(2) [ Fc = (eta(5)-C5H5)Fe(eta(5)-C5H4)] with MeI or p-BrCH2C6H4NO2, or of CyP(CH2OH)(2) with [FcCH(2)NMe(3)(+)]I gave hydroxymethylphosphanes FcCH(2)PR(CH2OH) (R = Me, Cy or p-O-2-NCH2C6H4) which were converted to the new secondary phosphanes FcCH(2)PHR on treatment with Na-2-S2O5. A series of longer-chain ferrocenylalkyl primary phosphanes Fc(CH2)(n)PH2 was also prepared by reactions of the bromoalkylferrocenes Fc(CH2)(n)Br (n = 4, 6 or 11) with P(CH2OH)(3) to give intermediate hydroxymethylphosphanes Fc(CH2)(n)P(CH2OH)(2), followed by reaction with Na2S2O5. Fc(CH2)(6)PH2 was converted into its crystalline BH3 adduct, which was structurally characterised. The synthesis of the new ruthenocene (Rc)-derived primary phosphane RcCH(2)PH(2), the first example of a ruthenocene-derived primary phosphane, is also reported. (C) 2014 Elsevier B. V. All rights reserved.