Elektronově nesymetrické ferrocenové bisfosfiny

Horký, Filip

This Thesis describes the synthesis, reactivity, coordination properties, and catalytic activity of novel electronically dissymmetric bisphosphines structurally related to 1,1'-bis(diphenylphosphino)ferrocene (dppf). First, a methylene spaced congener containing a primary phosphine group, which is stable in the air, Ph2PfcCH2PH2 (fc = ferrocene-1,1'-diyl), was prepared. While studying its reactivity, an unprecedented stable primary phosphine oxide, Ph2PfcCH2P(O)H2, was isolated. The primary phosphine, the corresponding phosphine oxide, dppf and the known bis-tertiary phosphine Ph2PfcCH2PPh2 were studied as ligands in Ru(II) complexes. The catalytic activity of the defined complexes was compared in two ruthenium-catalyzed reactions: cyclization of (Z)-3-methylpent-2-en-4-yn-1-ol into 2,3-dimethylfuran and isomerization of estragole to anethole. Second, the remarkable stability of the prepared primary phosphine oxide called for a detailed investigation of this poorly described class of compounds. As a result, stable primary phosphine chalcogenides lacking steric protection FcCH2P(Y)H2 (Fc = ferrocenyl; Y = O, S, Se) were isolated for the first time. These compounds were studied as ligands in reactions with hard and soft Lewis acids (Zn(II) and Ru(II)), and the reactivity of the P-H hydrogens was...

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