Protection O 0345Rapid Formation of Acetates under Microwave Irradiation Using Montmorillonite Acid Clay Catalyst. -Combination of microwave irradiation and acid montmorillonite catalyst dramatically enhances the rate of formation of acetates of alcohols, phenols and amines when treated with acetic anhydride. Scope and limitations of the methodology are studied. -(MALLAVADHANI*, U. V.; SAHOO, L.; ROY, S.; Indian J.
The O-alkylation of 4-hydroxybenzaldehyde (I) and corresponding acetophenone (XII) with allyl and propargyl bromide affords a range of interesting side products in addition to the expected ethers. In particular, the formation of the aryl-aryl coupling product (VIII) is worthy of mention due to the fact that this is the first example of loss of a formyl group followed by aryl-aryl coupling under mild alkylation conditions. The allyl ethers (IV) and (XIII) smoothly undergo thermal Claisen rearrangement furnishing the corresponding C-allylated products [cf. (XVI)], while propargyl ether (IX) surprisingly resists rearrangement. -(MALLAVADHANI, UPPULURI V.; MAHAPATRA, ANITA; NARASIMHAN, K.; SAHOO, L. D.; Indian J.
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