Acetate effect

Besides aldehydes and ketones, TiCl4 activates acetals effectively for reaction with enolates (Scheme 18).70,71 The reactivity of acetals is higher than that of the corresponding aldehydes in... 

Sodium Hydroxide and Sodium Acetate Effect on NH Volatility. Ammonia volatility measurements at various concentrations of so-dium hydroxide and sodium acetate at 80°C are given in Tables 23 and 24 respectively. Data on the effect of sodium hydroxide were measured using an ammonia probe from Orion Research Company. 

Table III. Homologation of Methyl Acetate to Ethyl Acetate Effect of Iodide Source...

Furthermore, the heterolysis reaction is catalyzed by the addition of anions (organic and inorganic oxy anions, e.g., acetate) (44,107, 110,111). Comparing the acetate effect in the presence of different chelating ligands ([15]aneN4 and nta) to those of the aquated system led to the conclusion that the oxy anions have to occupy the trans position to the R group in order to labilize the M-R bond (trans labilization effect) and thus catalyze the heterolytic decomposition (44,107,110,111). 

D. N. and Verboom, W. (1992) Alkaline-earh metal ion catalysis of alcoholysis of crown-ether aryl acetates. Effects of the base-solvent system./. Phys. Org. Chem., 5, 663. 

Fig 4. Hydrogenation of cupric acetate effect of cuprous acetate (5). 

Exposure of the silyl enol ethers of aldehydes to peracid in dichloromethane, followed by treatment of the intermediate masked hydroxy aldehyde (c/. (53) to (54) Section 2.3.2.1.3.i) with acetic anhydride and triethylamine, allows isolation of the product a-acetoxy aldehydes in moderate yield. Similarly treatment of the silyl enol ethers with LTA in acetic acid containing potassium acetate effects the same transformation. ... 

When cation exchange is performed, the counter ion is often not benign. Halide ions often accompany transition-metal cations into a zeolite structure and continue to coordinate to them. 11 Some anions such as acetate effect the pH, and this may alter the composition of the product zeolite. 

M. Terinek and A. Vasella, Synthesis of tetrahydropyridoimidazole-2-acetates Effect of carboxy and methoxcarbonyl groups at C(2) on the inhibition of some/>- and a-glycosidases, Helv. Chim. Acta, 87... 

One paradoxical characteristic with the slow addition procedure is observed for the most hydrolytically resistant alkenes, where the reaction proceeds faster the slower the reagent is added. As can be deduced from the discussion above, the slow addition and the acetate effect are not mutually exclusive, and can be used in combination for the most arduous alkenes (Table 3, entries 2 and 6). With the mechanistic insight into the details of the asymmetric dihydroxylation, and the remedies to maintain the enantioselectivity in the addition step, the enanti-oselectivity in the chiral selectors (DHQD-CLB and DHQ-CLB) became limiting factors in the AD process. 

Three synthetic priorities were set for this route 1) development of an efficient and economical way to access lactam lactol 69 2) optimization of the acetalization, effecting a crystallization-induced resolution, and isolation the diastereomerically pure desired acetal 71 3) investigation of the aryl Grignard addition and demonstration of the envisioned debenzylation/reduction step. In addition, a significant chore of ensuring that secondary amine 5 was sufficiently pure was of paramount importance. Assiduous analysis of secondary amine 5 impurity profiles was necessary to assure that this penultimate intermediate, as well as the final drug substance that would result from this process, was identical (or better) compared with previous batches. The final step in the synthesis. 

EDS A s. Ethyl (dime thy 1-sulfuranylidene)acetate Effect s. Solvents, Substituents Electrolysis 24, 75, 93, 282, 981 -, eletcroorganic synthesis, review 1, 715 suppl. 24 Electrophiles... 

The improvements in properties noted may be linked to several factors the reduction made possible in the water/cement ratio, a reduction in gross porosity, the entrainment of air as a fine dispersion, and specific interactions or bonds with the cement gel. Using electron microscopy, Wagner (1965, 1966, 1967) and Aignesberger et al (1969) have shown that melamine and vinyl resins form networks that interpenetrate the network formed by the cement gel. Also, using similar techniques, Pierzchala (1969) concluded that poly(vinyl acetate) effectively becomes a constituent of the cement gel, and makes it chemically resistant, even to hydrofluoric acid. 

Coriandmm sativum L. Linalool, a-terpinyl acetate, Effective against C solstitialis. Teuscher et al. (2004) and... 

Thallium(m) acetate effects a one-step synthesis of aliphatic a-acyloxy-carboxylic acids (Scheme 28) the transition state (92) is proposed. a-Aminoesters are readily oxidized to the corresponding a-diazoesters by isoamyl nitrite in the presence of acetic acid. A review has been published on the radical addition of carboxylic acids and derivatives to unsaturated linkages. ... 

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