Titanium methyl

The a-hydrogen transfer in the analogous titanium-methyl system is... 

Other studies on mixed Ti-Al systems as alkene polymerization catalysts have afforded examples of bridging between these two metals by cyclopentadienyl residues (69), by carbidic carbon atoms (70, 71, 72), " 5 and by methyl groups (74). The carbide systems 70, 71, and 72 were prepared by reactions between phosphinimido-titanium methyl compounds and trimethylaluminum. The coordination at the carbide carbon atoms in 70 and 72 is flattened tetrahedral. However, the coordination in 71 is distorted trigonal bipyramidal, with a near-linear Ti—C—Al vector (178.5°) (cf. 65 and 66) and bonding as in 67. 

Better yields of polyisobutylene (PIB) are therefore formed in more polar solvents when the solvent is incompletely dried. However, a possible role for adventitious sources of proton initiators in the Cp TiMe3/B(C6F5)a system seems unlikely as Cp TiMe3 readily eliminates proton sources the titanium—methyl bonds readily undergo protonolysis to methane. " The possibility of proton initiators has also been ruled out because the polymerizations proceed in nonpolar solvents such as toluene, in... 

Organofunctional polysiloxanes with silanol groups can be cross-linked at low temperatures with tetrabutyl titanium, methyl triacetoxy-silane, and similar compounds and are thus used as cold vulcanization materials. In contrast, hot vulcanizable silicones possess one vinyl group in about 500-1000 monomeric units and can be cross-linked with peroxides. All silicon rubbers are filled with highly dispersed silica since the unfilled rubber is practically a useless elastomer. 

Chien, J. C. W. Salajka, Z. Syndiospecific polymerization of styrene. I. Tetrabenzyl titanium/methyl aluminoxane catalyst. J. Polym. ScL, Part A Polym. Chem. 1991, 29, 1243-1251. 

The reaction of (IPr)TiCl4l7 with an excess of ZnMe2 at low temperature did not yield the expected NHC coordinated titanium methyl complex. Instead, the... 

In a classic paper in the field of Ziegler catalysis, experimental evidence into the insertion of an rmsaturated monomer into a titanium-methyl bond associated with a titanium cation was first reported by Eisch et al. [33]. 

In the early work the [Cp2TiCH3] cation has been trapped by insertion of the alkyne PhC=CSi ( 113)3 into the titanium methyl bond with the corresponding cationic vinyl titanium complex as the tetrachloroalu-minate in the Cp2TiCl2/Al(CH3)Cl2 system [122]. The importance of the anions in the coordinating sphere of... 

Structural distortions of hexacoordinate alkyl (Me and Et) titanium complexes are amenable to analysis by extended Huckel calculations.29 Alkyl complexes are key intermediates in transformations of alkenes catalysed by titanium and other metals.some relevant material is in a review of the literature year 1983 on titanium l while crystallographic data for organometallic titanium complexes are analysed and classified.32 Derivatives of N-sulphonylated norephedrines are good ligands for chirally modified titanium methyl complexes. These species react enantioselectively with aromatic aldehydes.33... 

H. Kawamura-Kuribayashi, N. Koga and K. Morokuma. An ab initio MO study on ethylene and propylene insertion into the titanium-methyl bond in CHjTiCP as a model of homogeneous olefin polymerization. J. Am. Chem. Soc. 114, 1992, 2359-2366. 

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