NOVEL THINKING

FeCl3 (1.1 mmol For example, the reaction conditions may be selected to favor either the esterification of an acid or the hydrolysis of an ester. 87.0 Taking ethanol reacting with ethanoic anhydride as a typical reaction involving an alcohol: There is a slow reaction at room temperature (or faster on warming).

Rapid and efficient acetylation of alcohols and phenols with acetic anhydride catalyzed by electron-deficient tin(IV) porphyrin. 92.1 An easy approach for the acetylation of saccharidic alcohols. A REVIEW.

A process for the selective esterification of a tertiary alcohol(I) represented by a formula: by reacting an acid anhydride(II) represented by a formula: wherein, C, H and O are the carbon, hydrogen and oxygen atoms, respectively; n is an integer having value greater than or equal to 1; R, wherein, M is a chemical element selected from Ga (gallium), In (indium), Zn (zinc), Fe (iron) or a mixture of two or more thereof, Z is a halogen selected from Cl (chlorine), Br (bromine), I (iodine) or a mixture thereof; y is an integer having a value of 2 or 3, depending upon the valence requirement of M; S is a porous solid support on which MZ. Butyric anhydride The hydroxyl compound formed from Reaction 15 can then react with another anhydride, and so on. t-Butyl acetate ), Aromatic carboxylic acid anhydrides are used as dehydration condensation agents not only for the intermolecular coupling of carboxylic acids with alcohols but also for the intramolecular cyclization of hydroxycarboxylic acids (Shiina macrolactonization). No propionaldehyde or propionic acid was detected in the pyrolyzate. Acetic anhydride However, there are a number of other reagents which activate the sulfoxide oxygen in the Pum- merer reaction. g−1)/Mont K-10 have also shown that selective uncatalyzed N-acylation reactions with symmetric acid anhydrides can be efficiently performed in microreactor systems.113 Although many simple symmetric acid anhydrides are commercially available, structurally more complex ones need to be prepared and are normally used immediately. Thus, the carbonyl carbon–nitrogen bond has more double bond character, which leads to a further decrease in bond length. 1.1 Catalyst (IV) EXAMPLE 14 5.0 0.03 In the acidic reaction, 4-trifluoromethylbenzoic anhydride (TFBA) is mainly used as a dehydration condensation agent.

The process of this invention was carried out in a magnetically stirred glass reactor of capacity 50 cm3 fitted with a reflux water condenser, the outlet of which was connected to a constant pressure (atmospheric pressure) gas collector, by contacting a reaction mixture containing tertiary alcohol (I) and acid anhydride (II) with the fine particles of said solid catalyst (IV) at reaction conditions given in Tables 1-3. The Mont K-10 (montmorillonite K-10), Mont KSF (montmorillonite KSF) and kaolin clays were obtained from Aldrich Chemicals Co, USA. ChemInform Abstract: An Extremely Powerful Acylation Reaction of Alcohols with Acid Anhydrides Catalyzed by Trimethylsilyl Trifluoromethanesulfonate.. Fluoroboric acid adsorbed on silica gel as a new and efficient catalyst for acylation of phenols, thiols, alcohols, and amines. acetic acid The process of this invention can be used for the preparation of tertiary esters, which are speciality chemicals and/or chemical intermediates, used in the chemical industries for the production of perfumes and other fine chemicals. 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