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Scheme IFurthermore, the base-catalyzed cyclization of -keto aldehydes gives much polymer, particularly where R is small.1 23 Indeed where R is a methyl group, the cyclization could not be done in solution at all.4Considered together, the characteristics of these two reactions would complement each other. To avoid polymerization in the aldol step, the concentration of keto aldehyde should be kept low. The acetal hydrolysis pro-

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