Tripodliganden mit drei verschiedenen Donorgruppen: Synthese und Koordination von CH3C(CH2PR2)(CH2PR′2)(CH2PR"2) / Tripod Ligands with Three Different Donor Groups: Synthesis and Coordination of CH3C(CH2PR2)(CH2PR′2)(CH2PR''2)

Abstract

Tripod ligands CH3C(CH2PR2)(CH2PR′2)(CH2PR″2), 6(a—e), with three different donor groups are obtained from CH3C(CH2Cl)(CH2Br)(CH2OSO2CF3), 3, by successive replacement of the three different leaving groups. 3 itself is easily accessible from CH3C(CH2OH)3 in a few simple steps. The general applicability of this strategy is demonstrated by the preparation of five different ligands 6(a—e). For one specific example (6 a) the coordination behaviour is examplified by the synthesis of its Mo(CO)3 derivative: CH3C(CH2P(Ph)2)(CH2P(3-Tol)2)(CH2P(4-Tol)2)• Mo(CO)3 (7). All compounds, including their intermediates CH3C(CH2Cl)(CH2Br)(CH2PR2), 4(a—c), and CH3C(CH2PR2)(CH2PR′2)(CH2C1), 5(a— c), have been obtained in an analytically pure state and fully characterized by their spectroscopic data. The methods developed lend themselves to the almost deliberate shaping of tripod metal templates.