Water → 2-Cyclopenten-1-one, 4-hydroxy-3-methyl-2-(2-propen-1-yl)-

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Twenty grams of a 300-mesh activated alumina (Wako Junyaku Co.) for use in column chromatography was suspended in 100 ml of a toluene-ether (1:1 by volume) mixture admixed with 2.4 g of water. To the suspension, was added 4.0 g of 4-hydroxy-4-methyl-5-allyl-2-cyclopentenone. The suspension was stirred at 30° C. for 24 hours and the alumina was separated by filtration. The separated alumina was extracted three times with 50 ml of a toluene-ether (1:1 by volume) mixture. The extract solutions were combined with the filtrate and concentrated. The concentrate was fractionally distilled in vacuo to obtain 2.5 g (62.5% yield) of 2-allyl-3-methyl-4-hydroxy-2-cyclopentenone boiling at 155° C./1 mmHg.

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