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Ferrocene acylphosphines
Vosáhlo, Petr ; Štěpnička, Petr (advisor) ; Čermák, Jan (referee) ; Horáček, Michal (referee)
6 Abstract The Thesis is aimed at the synthesis of novel ferrocene-based acylphosphines of the type FcC(O)PR2 and R1 2PfcC(O)PR2 2 (Fc = ferrocenyl, fc = 1,1'-ferrocendiyl), evaluation of their electron-donating capabilities and steric demands. The impact of these features was scrutinized by further coordination and catalytical studies. First, a series of monodentate acylphosphine ligands FcC(O)PR2 was synthesized (PR2 = diphenylphosphino [PPh2], dicyclohexylphosphino [PCy2], di(1-adamantyl)phosphino [PAd2] a 1,3,5,7-tetramethyl-2,4,6-trioxa-8- phosphaadamantyl [PCg]), which underwent oxidation by elemental selenium to give corresponding phosphine selenides used to probe their electron-donating capabilities via measuring 1 JPSe coupling constant. Then, chlorogold complexes were prepared from these ligands to evaluate their catalytic activity in gold-catalysed hydration of alkynes and cyclization of N-propargylbenzamide. Second, the model compound FcC(O)PPh2 was extensively studied as a ligand in palladium(II) complexes. The ligand was smoothly ortho-metallated by Na2[PdCl4] to form chloro-bridged palladium(II) dimer, which reacted with P-, N- and C-donors under cleavage to give monopalladium complexes. One of these complexes, containing trimethylphosphine auxiliary ligand, was alkylated with organometallic...
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Alternative synthesis of of 1-(diphenylphosphino)-1'-(N,N-dimethylaminomethyl)ferrocene
Zábranský, Martin ; Štěpnička, Petr (advisor) ; Vojtíšek, Pavel (referee)
An alternative, more straightforward and effective method for the preparation of 1- (diphenylphosphino)-1'-(N,N-dimethylaminomethyl)ferrocene was developed using 1-bromo- 1'-(diphenylphosphino)ferrocene as the starting material and Eschenmoser's salt as an aminomethylation agent. Purity of thus prepared phosphinoamine was verified by 1 H and 31 P NMR spectroscopy and by comparison of the data with those reported in the literature (M. E. Wright, Organometallics, 1990, 9, 853). The coordination chemistry of this compound was investigated in gold(I) complexes. Thus, chlorido[1-(diphenylphosphino)-1'-(N,N-dimethyl- aminomethyl)ferrocene]gold(I) complex was synthesized and converted to ill-defined [1- (diphenylphosphino)-1'-(N,N-dimethylaminomethyl)ferrocene]gold(I) perchlorate by halogen abstraction with AgClO4. Protonization of the nitrogen atom in both compounds with hydrogen chloride yielded the corresponding hydrochlorides. It was shown that 1- (diphenylphosphino)-1'-(N,N-dimethylaminomethyl)ferrocene is coordinated as a simple phosphine in the resulting complexes while its amine nitrogen is protonated. All these complexes were characterized by means of 1 H, 31 P and 13 C NMR spectroscopy, mass spectroscopy with electrospray ionisation, elemental analysis and by single-crystal X-ray diffraction analysis.
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Alternative synthesis of of 1-(diphenylphosphino)-1'-(N,N-dimethylaminomethyl)ferrocene
Zábranský, Martin ; Štěpnička, Petr (advisor) ; Vojtíšek, Pavel (referee)
An alternative, more straightforward and effective method for the preparation of 1- (diphenylphosphino)-1'-(N,N-dimethylaminomethyl)ferrocene was developed using 1-bromo- 1'-(diphenylphosphino)ferrocene as the starting material and Eschenmoser's salt as an aminomethylation agent. Purity of thus prepared phosphinoamine was verified by 1 H and 31 P NMR spectroscopy and by comparison of the data with those reported in the literature (M. E. Wright, Organometallics, 1990, 9, 853). The coordination chemistry of this compound was investigated in gold(I) complexes. Thus, chlorido[1-(diphenylphosphino)-1'-(N,N-dimethyl- aminomethyl)ferrocene]gold(I) complex was synthesized and converted to ill-defined [1- (diphenylphosphino)-1'-(N,N-dimethylaminomethyl)ferrocene]gold(I) perchlorate by halogen abstraction with AgClO4. Protonization of the nitrogen atom in both compounds with hydrogen chloride yielded the corresponding hydrochlorides. It was shown that 1- (diphenylphosphino)-1'-(N,N-dimethylaminomethyl)ferrocene is coordinated as a simple phosphine in the resulting complexes while its amine nitrogen is protonated. All these complexes were characterized by means of 1 H, 31 P and 13 C NMR spectroscopy, mass spectroscopy with electrospray ionisation, elemental analysis and by single-crystal X-ray diffraction analysis.
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