Ti synthesis

Synthesis parameters 02-0-02 02-P-08 Synthesis, particulate precursors Synthesis, pH effect Synthesis, phosphates, substituted Synthesis, phosphates, Ti Synthesis, phosphates, W Synthesis, porosils Synthesis, rare earth silicates Synthesis, SAPO-11... 

Ti, B, Ni, Cr, Fe, Co, Mn) has been described, as was the synthesis of nonsiliceous materials such as oxides of W, Fe, Pb, Mo, and Sb [18]. Although these materials do not represent tme zeolites, they are highly interesting materials which are commonly covered in the zeolite literature with great potential for shape-selective catalysis of bulky molecules. 

K. Osseo-Asare, F. J. Arriagada, and J. H. Adair, "Solubility Relationships in the Coprecipitation Synthesis of Barium Titanate Heterogeneous Equihbria in the Ba—Ti—C2O4—H2O System," in G. L. Messing, E. R. Fuller, Jr., and Hans Hausin, eds.. Ceramic Powder Science Vol. 2,1987, pp. 47-53. 

Titanium Silicides. The titanium—silicon system includes Ti Si, Ti Si, TiSi, and TiSi (154). Physical properties are summarized in Table 18. Direct synthesis by heating the elements in vacuo or in a protective atmosphere is possible. In the latter case, it is convenient to use titanium hydride instead of titanium metal. Other preparative methods include high temperature electrolysis of molten salt baths containing titanium dioxide and alkalifluorosiUcate (155) reaction of TiCl, SiCl, and H2 at ca 1150°C, using appropriate reactant quantities for both TiSi and TiSi2 (156) and, for Ti Si, reaction between titanium dioxide and calcium siUcide at ca 1200°C, followed by dissolution of excess lime and calcium siUcate in acetic acid. 

Synthesis of terminal olefine from ketones or esters via a Ti methylene transfer reagent. 

Titanium trichloride [7705-07-9] M 154.3, m >500 , pKj 2.55 (for hydrolysis of Ti to TiOH ). Brown purple powder that is very reactive with H2O and pyrophoric when dry. It should be manipulated in a dry box. It is soluble in CH2CI2 and tetrahydrofuran and is used as a M solution in these solvents in the ratio of 2 1, and stored under N2. It is a powerful reducing agent. [Inorg Synth 6 52 I960, Synthesis 833 7989.]... 

Thromboxane A2 is a potent platelet aggregating agent and vasodilator which undergoes rapid hydrolysis under physiological conditions (ti/2 32 sec. at pH 7 and 37°C). The synthesis of stable analogs was of interest for biological studies of this potent but evanescent prostanoid. 

The first (inconclusive) work bearing on the synthesis of element 104 was published by the Dubna group in 1964. However, the crucial Dubna evidence (1969-70) for the production of element 104 by bombardment of 94PU with loNe came after the development of a sophisticated method for rapid in situ chlorination of the product atoms followed by their gas-chromatographic separation on an atom-by-atom basis. This was a heroic enterprise which combined cyclotron nuclear physics and chemical separations. As we have seen, the actinide series of elements ends with 103 Lr. The next element should be in Group 4 of the transition elements, i.e. a heavier congenor of Ti, Zr and Hf. As such it would be expected to have a chloride... 

The Madelung indole synthesis has been employed in the preparation of some complex indole systems. Uhle et al. reported the conversion of N-formyl-5,6,7,8-tetrahydronaphthylamine 28 into 1,3,4,5-tetrahydrobenz[c,ti]indole 29 with t-BuOK in 11% yield in regard to synthesis of ergot alkaloids. ... 

The Ti -coordinated Mn(CO)3 cationic complexes of thiophenes follow mainly from the direct interaction of a heterocyclic ligand with Mn(CO)5X (81HCA1288). The first successful synthesis of 79 (R = = H = Me, R = R" =... 

The synthesis of cyclopentadienyliron(Ti -indolyl) proceeds through formation of 110 (88PAC1193). Transformation into the -complex occurs at elevated temperatures. Carbazole forms only the A-carbazolyl complex 111 under these circumstances. However, carbazole with ferrocene and aluminum chloride/aluminum powder gives the Ti -coordinated dication 112 [80JOM(186)265]. 

R. O. Duthaler, A. Hafner, M. Riediker in Asymmetric C-C Bond Formation with Ti-, Zr-, and Hf-Carbohydrate Complexes in Organic Synthesis via Organometallics, K. H. Dotz, R.W Hoffmann, Eds., pp 285-310, Vieweg, Braunschweig 1990. 

A closely related asymmetric synthesis of chiral sulphoxides, which involves a direct oxidation of the parent sulphides by t-butylhydroperoxide in the presence of metal catalyst and diethyl tartrate, was also reported by Modena and Di Furia and their coworkers-28-7,288 jjje effect 0f the reaction parameters such as metal catalyst, chiral tartrate and solvent on the optical yield does not follow a simple pattern. Generally, the highest optical purities (up to 88%) were observed when reactions were carried out using Ti(OPr-i)4 as a metal catalyst in 1,2-dichloroethane. 

The enantioselection depends greatly on the nature of the R2 group at the boron atom, and the ee values were as high as 97 %. High enantioselectivity was observed in the synthesis of 4-dihydropyranones, based on the Diels-Alder reactions of aldehydes 74 and Danishefsky s diene, catalyzed by a BINOL-Ti(0-i-Pr)4-derived catalyst [75] (Equation 3.23). 

The intramolecular Diels-Alder reaction of 78 was investigated during the synthesis of isoquinoline alkaloids [65ij. No reaction occurred when solid-phase conditions were used (Florosil in DCM and CaCli) or when a variety of Lewis acids were employed (SnCU, BF3, RAICI2, Ti(z — Pr)4-TiCl4). A 56 % yield of 79 was obtained by carrying out the cycloaddition in toluene in a sealed tube at 200 °C. jS-CD catalysis in water under milder conditions (Equation 4.11) improved the conversion to 84 %. 

The Cp Ti(amidinate) fragment provides a particularly useful platform for the synthesis of novel titanium imido complexes and the study of their unusual reactivity. Numerous single-, double-, and cross-coupling and imido-transfer reactions were investigated using these compounds. The synthetic routes leading to CpTi and Cp Ti amidinate derivatives are outlined in Scheme... 

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