Disilene complexes

The chemistry of the disilenes (disilaethenes) has developed very rapidly since the discovery of stable compounds. It was an obvious challenge to explore also the possibility of a n-coordination of disilenes to transition metals. According to the Dewar-Chatt-Duncason bonding model, a high stability for a disilene complex should result. 

Disilenes are generally unstable with respect to polymerization. However, if very bulky groups are attached to the silicon atoms then they can be obtained as stable compounds.54 Such disilenes react with in situ generated [PL(PR3)2] to give disilene complexes analogous to alkene complexes.50... 

Before moving on to M=Si bonded compounds, mention should be made of the disilene complexes (Equation (6)), which are formed as (E)- and (Z)-isomers in 28% and 9% yields, respectively ( )-to-(Z)-isomerization follows first-order kinetics.173... 

The first 7]2-disilene complexes of palladium were described in 2003 structural data for L2Pd 7]2-(Me2ButSi)2Si=Si(SiMe2But)2 (L2 = (PMe3)2 or dmpe) indicate that a metallocyclic description with strong... 

The NMR resonances for the central 29Si nuclei of tetrakis(trialkylsilyl)disilene complexes in solution vary from —160 ppm for 241 to 127 ppm for 240, depending on the bonding characteristics of the disilene ligands to the metals for reference, the 29Si NMR resonances for hexakis(trialkylsilyl)cyclotrisilanes and free disilene 22 are... 

Hydrido-disilanyl complexes L M(H)(SiR2-SiR2H) are interesting because H2 elimination could support a possible 3-Si-H elimination and result in disilene complexes or products derived thereof Analogous to the synthesis of the well-known hydrido-silyl complexes... 

The disilene complex Cp2W(T -Me2Sia iMe2) reacts widi S, Sc. and Tc to give the symmetric Si-Si insertion product, while with phosphine chalcogenides, a small amount the... 

X-ray crystallography. The observation that our platinum-silicon 4MR can be formed from reagents with Si-Si single bonds is also consistent with the P2 h bonding description. West has prepared monoplatinum complexes of disilenes from disilenes or disilanes by three routes. One route, which is similar to the reaction depicted in Eg.4, is shown in Eg.5. The platinum disilene complexes are described by the two resonance forms drawn in Eg.5. (It is interesting to note that oligomeric silanes are obtained as by-products of Eg.5.)... 

Fischer R, Zimgast M, Flock M, Baumgartner J, Marschno- C (2005) Synthesis of a hafnocene disilene complex. J Am Chem Soc 127 70... 

Hashimoto H, Sekiguchi Y, Iwamoto T, Kabuto C, Kira M (2002) Synthesis and X-ray structure of a platinum -disilene complex. Organometallics 21 454... 

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