A synthetic and X-ray crystallographic study of the indenyl-phosphine complexes 1,3-(Ph2PX)2(C9H6), (X=O, S) and (η5-C9H5(Ph2PS)2)[Mn(CO)3]: versatile ligands for the preparation of heteropolymetallic complexes
摘要:
The syntheses and X-ray crystal structures of the oxidized indenyl-diphosphines, 1,3-(Ph2P=X),2C9,H-6, where X is O, S, are reported. The sulfur complex is readily deprotonated to form the corresponding 1,3-disubstituted indenide anion, which yields a crystallographically-characterized eta(5)-Mn(CO)(3) complex upon treatment with bromopentacarbonylmanganese. The relevance of these molecules to mixed-metal catalytic systems is discussed. (C) 1998 Elsevier Science S.A. All rights reserved.
Platinum pincercomplexes featuring an SCS indenediide backbone have been prepared and evaluated in the catalyticcycloisomerization of alkynoic acids and N‐tosyl alkynylamides. One of the platinum complexes significantly outperforms its palladium analogue for the formation of 6‐ and 7‐membered rings. The catalytic system takes advantage of the alkynophilicity of Pt and of the non‐innocent character
synthetic methodology based on transmetallation was developed for the preparation of SCS indenediide pincer complexes. Upon reaction of the 1,3-bis(thiophosphinoyle)indene 1 with [Zr(NMe2)4], Csp3-H activation proceeds readily to give the new complex 2. Thermolysis at 100 °C for 5 h then affords the SCS pincer complex 3. Complex 2 can be stored under inert atmosphere for several weeks without decomposition
IndH(2)(Ph2P=X)(2)] derivatives (1, X = NMes; 4, X = S) react with [Zr(NMe2)(4)] and [PdCl2(cod)] to afford the complexes [Ind(Ph(2)PNMes)(2)]Zr(NMe2)(2)} (3), [lnd(Ph2PS)(2)]Zr(NMe2)(2)} (5), and [Ind(Ph2PS)(2)]Pd(HNc-Hex(2))} (7). The ability of the phosphazene and thiophosphinoyl side arms to support the coordination of the indenyl ring as 2-indenylidene was evidenced by NMR spectroscopy and X-ray diffraction studies. Analysis of the bonding situation by density functional theory calculations revealed a strong a interaction but a negligible (if any) pi interaction between C2 and the metal.