Lead acetate Lutidines

Acid acceptors Lead acetate trihydrate. 2,6-Lutidine. Magnesium oxide. Mercuric oxide. Pyridine. Sodium acetate. 

Dimethylaminopyridine 4,6-Dinitro-o-cresol Diphenylamine Disodium octaborate tetrahydrate Endosulfan Ethiofencarb 6-Ethoxy-1,2-dihydro-2,2,4-trimethylquinoline 2-Ethylhexanal Ethyl hexanediol 2-Ethylhexenal 2-Ethyl-2-hexenal Ethyl-p-nitrobenzoate Etrimfos Fenamiphos Fenpropathrin Fenthion Fluometuron Furfural Glyoxalic, acid Hexachloro-1,3-butadiene Hexachloroethane Hydramethyinon 2-Hydroxy-2-methylpropanenitrile 2-Imidazolidinone lodofenphos Isofenphos Isooctyl thioglycolate Isopropanolamine Kojic acid Laurie acid Lead acetate Lead acetate trihydrate Lead naphthenate 2,6-Lutidine Mecarbam Mercury chloride (ic) Metam-sodium P-Methylnaphthalene Naphthalene Nicotine Oxamyl Parathion-methyl Pentaerythritol Perchloropentacyclodecane Permethrin Phenothiazine Phenylmercuric acetate Phorate Phosalone Phoxim Phthalic anhydride a-Pinene Pine (Pinus palustris) tar oil Piperazine Piperazine dihydrochloride... 

Pt(II). Fujimura has developed a Pt(II)-catalyzed process for the addition of iso-butyrate-derived silyl ketene acetal 97 to aldehydes (Eq. (8.27)) [43]. The process utilizes a readily available Pt(Il) complex (98) that is generated in situ and can be easily handled in the laboratory [44]. In the presence of 5 mol% each of 98, triflic acid, and lutidine, 97 undergoes addition to aldehydes to afford a mixture of tri-methylsilyl-protected 99 and free alcohol 100 products in up to 95% ee. A thorough examination of the reaction conditions and their effect on the product selec-tivities has revealed that the addition of water and oxygen to the catalyst mixture leads to significant improvement in the optical purity of the products. A number of spectroscopic studies by P NMR and IR has led Fujimura to postulate that the reaction involves a carbon-bound platinum enolate intermediate in the catalytic cycle. 

For some enzymes, such as Pseudomonas sp. lipase (PSL), the liberated acid does not present any problems, but others like CRL are more sensitive and require more protection. For instance, when acetic anhydride is used, the Uberated acetic acid may lead to a decrease of the pH in the micro-environment of the enzyme, thus leading to a depletion of activity and selectivity. The CRL-catalyzed resolution of the bicyclic tetrachloroalcohol shown in Scheme 3.5, using acetic anhydride as acyl donor, initially proceeded with only moderate selectivity (E = 18). Addition of a weak inorganic or (preferably) organic base such as 2,6-lutidine which functions... 

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