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Organic Reactions on Zeolites

Zeolites Serving Dual Functions of Acid and Base [Pg.247]

O-Alkylation of alcohols with alkylating agents is a practical method not only for the synthesis of unsymmetrical ethers (16), but also for protecting hydroxyl groups (17). The alkylation reactions are usually conducted under strongly basic conditions via the formation of alkoxides from alcohols. However, an alternative method performed under neutral conditions would be desirable for the conversion of alcohols that are sensitive to strong bases. [Pg.247]

To investigate functions of inorganic solids on bimolecular nucleophilic substitution reactions, zeolite and y-alumina were applied as promoters for accelerating the benzylation of alcohols, a familiar reaction for the protection of OH groups in alcohols (18)  [Pg.247]

Zeolite and alumina were calcined at S00°C for S h in air prior to use. A mixture of alcohol, benzyl chloride, and powdered zeolite or alumina was stirred in a nonpolar solvent (hexane or carbon tetrachloride) under reflux for S h in an inert atmosphere. After the reaction, water was added and the mixture was refluxed for 0.5 h in order to remove organic products completely from the solid surfaces. [Pg.247]

Typical results for the benzylation of 1-decanol in hexane are shown in Table I. Although an insoluble base such as K2CO3 was ineffective for the reaction, alkali metal cation-exchanged Y-type zeolites efficiently induced the reaction, and the highest yield (73%) was obtained when KY was used. The [Pg.247]


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