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Coumalic acid undergoes thermal reaction with 1,3-butadiene to yield dimethyl tricycle[3.2.1.02,7]oct-3-ene-2,4-dicarboxylate.
George A.Kraus; Sean Riley; Travis Cordes. Aromatics from pyrones: para-substituted alkyl benzoates from alkenes, coumalic acid and methyl coumalate. Green Chem. 2011, 13,(10), 2734-2736.
Michio Ohi; Takashi Kitamura; Shuichi Hata. Stimulation by caffeic acid, coumalic acid, and corilagin of the germination of resting spores of the clubroot pathogen Plasmodiophora brassicae. Bioscience, Biotechnology, and Biochemistry. 2003, 67,(1), 170-173.
Precursor, by decarboxylation, of 2-pyrone (ɑ-pyrone), a valuable diene in the Diels-Alder reaction: Org. Synth. Coll., 5, 982 (1973).