Synthesis and electrochemical properties of a series of ferrocene-containing alcohols
摘要:
A series of primary ferrocenylalcohols, Fc-(CH2)(m)-OH with m = 1-4 and Fc = ferrocenyl, was synthesised by reduction of the appropriate ferrocenylcarboxylic acids, Fc - (CH2)(n)- COOH (n = 0-3) and the ester methyl 4-ferrocenylbutanoate with LiAIH(4), the reduction of the gamma-ketoacid ferrocylpropanoic acid, Fc-CO-(CH2)(2)-COOH, with AlCl3/LiAlH4, and the reduction of ferrocenylcarboxaldehyde, FcCHO, with NaBH4. The secondary ferrocenyl alcohols CpFe(C5H4-CH(OH)-CH3) and Fe(C5H4-CH(OH)-CH3)(2) were obtained by NaBH4 reduction of acetyl and diacetyl ferrocene. The different reduction methods are compared. The electrochemistry of the alcohols was studied by cyclic voltarnmetry in CH3CN/0.1 M N("BU)(4)PF6 utilising a platinum working electrode. The ferrocenyl group showed reversible electrochemistry with the formal reduction potential (E-o ' versus Fc/Fc(+)) of the ferrocenyl group inversely proportional to side chain length. The influence of the side chain length on E-O ' was more pronounced for the acids because the electron-withdrawing properties of the carbonyl group is stronger than that of the alcohol group. Ion pairing was found to play a major role in the electrochemical behaviour of ferrocenylmethanol, Fc-CH2-OH. (c) 2005 Elsevier Ltd. All rights reserved.
Simple reduction of ferrocenyl aldehydes and ketones by sodium boranuide in trifluoroacetic acid: new, efficient, general preparation of alkylferrocenes
Ionic Hydrogenation of Acylferrocenes Using Zinc Borohydride: An Efficient, Mild Method for the Preparation of Alkylferrocenes
作者:Sukanta Bhattacharyya
DOI:10.1021/om950751n
日期:1996.2.6
An effective mild procedure for the reductive deoxygenation of α-ferrocenyl aldehydes, ketones, and alcohols into the corresponding alkylferrocenes is described using a combination of zinc borohydride and zinc chloride. This is the first example of such reactivity of zinc borohydride. The present method allows the synthesis of alkylferrocenes bearing terminally functionalized pendant chains.