The Experts below are selected from a list of 12 Experts worldwide ranked by ideXlab platform
Wang Gong-ying - One of the best experts on this subject based on the ideXlab platform.
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Organotitanium Compound Catalysts for Transesterification of Dimethyl Carbonate and Phenyl Acetate to Diphenyl Carbonate
Chinese Journal of Catalysis, 2009Co-Authors: Wang Gong-yingAbstract:The catalytic performance of some Organotitanium Compounds for transesterification of dimethyl carbonate (DMC) and phenyl acetate (PA) to diphenyl carbonate (DPC) was measured. It was found that titanium oxide acetylacetonate (TiO(acac)2) was an efficient catalyst compared with the other Compounds. Under the optimal conditions (n(PA)=0.8 mol,n(DMC)/n(PA)=1/2,n(TiO(acac)2)/n(PA)=0.006,θ=180 ℃,t=4 h),the conversion of DMC was 74.9%,and the selectivity for DPC and MPC was 38.9% and 56.9%,respectively.
Gregory S. Girolami - One of the best experts on this subject based on the ideXlab platform.
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Mechanistic Studies of the Thermolysis of Tetraneopentyltitanium(IV). 2. Solid State and Ultra-High-Vacuum Studies of the Chemical Vapor Deposition of TiC Films
Journal of the American Chemical Society, 1997Co-Authors: Jinwoo Cheon, Lawrence H. Dubois, Gregory S. GirolamiAbstract:The chemical pathway responsible for the conversion of the Organotitanium Compound tetraneopentyltitanium to titanium carbide has been studied under chemical vapor conditions and on single crystals in ultra-high vacuum. For every equivalent of TiNp4 consumed in the deposition process, 3.28 equiv of neopentane and 0.16 equiv of isobutane are produced; other organic species are also formed but in relatively small amounts. About 93% of the carbon and hydrogen originally present in the precursor can be accounted for in these products. Thermolysis of the specifically deuterated analogue Ti(CD2CMe3)4 yields a 2.25:1 ratio of neopentane-d3 and neopentane-d2; this result combined with a kinetic isotope effect of 4.9 at 385 K shows unequivocally that the first step in the deposition pathway under CVD conditions is α-hydrogen abstraction. The α-hydrogen abstraction step produces 1 equiv of neopentane and a titanium alkylidene, which undergoes further α- (and eventually γ-) hydrogen activation processes to generate ...
Jinwoo Cheon - One of the best experts on this subject based on the ideXlab platform.
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Mechanistic Studies of the Thermolysis of Tetraneopentyltitanium(IV). 2. Solid State and Ultra-High-Vacuum Studies of the Chemical Vapor Deposition of TiC Films
Journal of the American Chemical Society, 1997Co-Authors: Jinwoo Cheon, Lawrence H. Dubois, Gregory S. GirolamiAbstract:The chemical pathway responsible for the conversion of the Organotitanium Compound tetraneopentyltitanium to titanium carbide has been studied under chemical vapor conditions and on single crystals in ultra-high vacuum. For every equivalent of TiNp4 consumed in the deposition process, 3.28 equiv of neopentane and 0.16 equiv of isobutane are produced; other organic species are also formed but in relatively small amounts. About 93% of the carbon and hydrogen originally present in the precursor can be accounted for in these products. Thermolysis of the specifically deuterated analogue Ti(CD2CMe3)4 yields a 2.25:1 ratio of neopentane-d3 and neopentane-d2; this result combined with a kinetic isotope effect of 4.9 at 385 K shows unequivocally that the first step in the deposition pathway under CVD conditions is α-hydrogen abstraction. The α-hydrogen abstraction step produces 1 equiv of neopentane and a titanium alkylidene, which undergoes further α- (and eventually γ-) hydrogen activation processes to generate ...
Zhang Fuba - One of the best experts on this subject based on the ideXlab platform.
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Organotitanium Compound catalysts for transesterification of dimethyl oxalate with phenol
Journal of Molecular Catalysis, 2014Co-Authors: Zhang FubaAbstract:The catalytic performance of several Organotitanium Compounds for transesterfication of dimethyl oxalate with phenol was investigated. The results showed that the catalytic activities and selectivities were in the order: Cp2 TiCl2 Ti( OPh)4 Ti( OBu)4 TiO( acac)2 Ti( OEt)4 Ti( OEt)4. This means that Cp2TiCl2was an efficient transesterfication catalyst compared to the others. Under the optimal conditions( n( Cp2TiCl2) = 0. 001 mol,n( DMO) =0. 3 mol,n( Phenol) = 0. 2 mol,T =180 ℃,t =2 h),the conversion of phenol reached 4 4. 0%, and the yield of MPO and DPO were 37. 8% and 6. 1%,respectively,while the total transesterfication selectivity was 99. 8%.
Lawrence H. Dubois - One of the best experts on this subject based on the ideXlab platform.
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Mechanistic Studies of the Thermolysis of Tetraneopentyltitanium(IV). 2. Solid State and Ultra-High-Vacuum Studies of the Chemical Vapor Deposition of TiC Films
Journal of the American Chemical Society, 1997Co-Authors: Jinwoo Cheon, Lawrence H. Dubois, Gregory S. GirolamiAbstract:The chemical pathway responsible for the conversion of the Organotitanium Compound tetraneopentyltitanium to titanium carbide has been studied under chemical vapor conditions and on single crystals in ultra-high vacuum. For every equivalent of TiNp4 consumed in the deposition process, 3.28 equiv of neopentane and 0.16 equiv of isobutane are produced; other organic species are also formed but in relatively small amounts. About 93% of the carbon and hydrogen originally present in the precursor can be accounted for in these products. Thermolysis of the specifically deuterated analogue Ti(CD2CMe3)4 yields a 2.25:1 ratio of neopentane-d3 and neopentane-d2; this result combined with a kinetic isotope effect of 4.9 at 385 K shows unequivocally that the first step in the deposition pathway under CVD conditions is α-hydrogen abstraction. The α-hydrogen abstraction step produces 1 equiv of neopentane and a titanium alkylidene, which undergoes further α- (and eventually γ-) hydrogen activation processes to generate ...