<P> Ethyl 2 - methylacetoacetate and campholenic aldehyde react in an Aldol condensation . The synthetic procedure is typical for this type of reaction . In the process, in addition to water, an equivalent of ethanol and carbon dioxide are lost in decarboxylation . </P> <P> Ethyl glyoxylate 2 and diethyl 2 - methylglutaconate 1 react to isoprenetricarboxylic acid 3 (isoprene skeleton) with sodium ethoxide . This reaction product is very unstable with initial loss of carbon dioxide and followed by many secondary reactions . This is believed to be due to steric strain resulting from the methyl group and the carboxylic group in the cis - dienoid structure . </P> <P> Occasionally an aldol condensation is buried in a multistep reaction or in catalytic cycle such as the one sketched below: </P> <P> In this reaction an alkynal 1 is converted into a cycloalkene 7 with a ruthenium catalyst and the actual condensation takes place with intermediate 3 through 5 . Support for the reaction mechanism is based on isotope labeling . </P>

What are possible names for the product molecule of aldol condensation