Diallyl ketals

Kelals. Its use for the conversion of ketones to ketals is illustrated by a procedure for the preparation of cyclohexanone diallyl ketal. A solution of cyclohexanone,... 

A convenient preparation of 2-allylcyclohexanone involves simply heating the diallyl ketal of cyclohexanone in toluene containing a trace of p-toluenesulfonic acid and collecting a distillate consisting of toluene and allyl alcohol. Distillation of the residue gives a 90% yield of 2-allylcyclohexanone. Outline the mechanism of this reaction. 

A mixture of acetone diallyl ketal and acetone dimethyl ketal acidified with p-toluenesulfonic acid, and after 15 min. at 24° made basic by addition of a soln. of Na-methoxide in methanol acetone allyl methyl ketal. Y 96% based on a redistribution ratio of 1 2 1. F. e. s. N. B. Lorette and W. L. Howard, J. Org. Ghem. 25, 521, 525 (1960). 

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