Chemistry Letters, Vol.33, No.10, 1296-1297, 2004
Synthesizing multidentate ferrocenylphosphines: A powerful route to dissymmetrically Tri-substituted ferrocenes. X-ray structure and C-13 NMR of a diaryl-alkyl-phosphino ferrocene
As a powerful route to multidentate ferrocenylphosphines, the synthetic strategy which consists in successively reacting FeCl2 with the suitably substituted cyclopentadienyllithium salts was carried out. The new mixed diaryl/alkyl triphosphine 1,2-bis(diphenylphosphino)-l'-(diisopropylphosphino)-4-tert-butyl-ferrocene, Fc(P)(2)'Bu(P'Pr), was obtained in good yield (70%). A very rare through-space nuclear spin-spin coupling J(CP) = 5.5 Hz was evidenced from its reported C-13 NMR and X-ray molecular structure characterizations.