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735377 
Journal Article 
Iminophosphorane-based synthesis of multinuclear ferrocenyl urea, thiourea and guanidine derivatives and exploration of their anion sensing properties 
Lorenzo, A; Aller, E; Molina, P 
2009 
1 
Tetrahedron
ISSN: 0040-4020 
65 
7 
1397-1401 
WOS:000263153100022 
One-flask preparation of bisferrocenyl-substituted urea and thiourea and trisferrocenyl-substituted guanidine have been achieved from the iminophosphorane derived from ferrocenemethyl azide by using aza-Wittig reactions with carbon dioxide and carbon disulfide. Electrochemical Studies indicate that there is no electronic communications between the peripheral ferrocene units and only one reversible redox wave is observed, which underwent a remarkable cathodic shift (Delta E-1/2 100-170 mV) in the presence of dihydrogenphosphate anion. (C) 2008 Elsevier Ltd. All rights reserved. 
Iminophosphoranes; Aza-Wittig reaction; Anion sensing; Electrochemistry