Acetals alkyl

Diisobutylaluminium benzeneteUurolate, generated in situ from diphenyl ditelluride and diisobutylaluminium (DIBAL), reacts with acetals, alkyl sulphonates and oxiranes, giving the expected tellurides in high yields. ... 

Unlike typical aldehydes, 1 mol of glucose reacts with only 1 mol of ROH in dry HCI to give two isomeric acetals (alkyl glycosides). See Problem 15.35. 

PET degrades thermally during processing at 280-300 °C. The chain scission is catalyzed by transesterification catalysts (zinc, manganese or cobalt acetates, alkyl titan-ates). PET is stabilized by tributyl phosphate (46) or triphenyl phosphate (47), considered as heat stabilizers and metal deactivators (Karayannidis et al., 1998). 

In the alkaline medium, the reagent is postulated to be hydroxymethylamine or methylenc-bis-amine, - - although the participation of the N,0-acetal (Alkyl-O—CH2— N<), when the reaction is carried out in alcoholic solvents, cannot be excluded, and relevant amounts of methyleneimmonium cation are observed. The C-NMR measurements indicate that the methylolamine concentration is maximum when the molar ratio amine/aldehyde is ca. 1, whereas the formation of methylene-bis-amine is favored when this ratio increases. 

The reaction of chloromethyl methyl ether (MOM-Cl, a carcinogen) with an alkoxide or with an alcohol in the presence of /-Pr2NEt (Hiinig s base) furnishes the corresponding formaldehyde acetal. Alkylation of 3°-alcohols requires the more reactive MOM-I, derived from MOM-Cl and Nal in the presence of /-ProNEt. ... 

Linear polyurethanes dissolve in various solvents such as ketones (methyl ethyl ketone, cyclohexanone, etc.), acetate alkyl esters (methyl acetate, butyl acetate), THF, dimethylformamide, methylene chloride, trichloroethane, etc. 

Aliphatic pseudo bases, e.g., 19 20 (R = R = R" = Me), are much less stable they are colorless water-soluble liquids which resinify rapidly in the air. For their preparation, barium carbonate can be replaced by sodium carbonate, sodium hydrogen carbonate, or sodium acetate. Alkyl-aryl derivatives are also unstable, because in these cases anhydro bases are also formed and the possibilities for aldol condensations or polymerizations are greatly increased. 

R = acetal, alkyl, cyclic-alkyl, silyl, silylether R = heteroaiyl, alkyl, halo, ester... 

R = CF3SO2-, acetate, alkyl, acetyl Fig. 3.9. Derivatization of aromatic position 5 of phenyl tetrahydrophthalimide. 

Heat-shrinkable film comprised single-site catalyzed Babrowicz et al. (1994) copolymer of ethylene and a 3-8C alpha-olefin, LLDPE with p > 9(X) kg m blended with another polymer of ethylene and a 3-8C alpha-olefin and a second comonomer [e.g., vinyl acetate, alkyl acrylate, CO, butadiene, styrene, acrylic acid, and a metal salt of an acrylic acid], or an alpha-olefin homopol3uner. The films had improved shrinkability, impact resistance, and optical properties as compared to prior art and were used in packaging... 

Vinyl acetate Alkyl acrylate Single Tg FTIR I had an alkyl group of methyl, ethyl, or butyl Princi et al. (2009)... 

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