has specified reactant aldehyde molecular skeleton joining reaction Baylis-Hillman reaction A carbon-carbon coupling of an aldehyde to an activated alkene in the presence of a nucleophilic base to give an alpha-hydroxyalkylated compound. MBH reaction Morita-Baylis-Hillman reaction RXNO RXNO:0000076 https://www.rsc.org/Merck-Index/reaction/r27/ https://www.wikidata.org/wiki/Q812563