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Publikováno v:
Helvetica Chimica Acta. 96:1488-1541
Methyl heptalenecarboxylates of type A and B with π(1) and π(2) substituents in 1,4-relation (Scheme 1) were synthetized starting with dimethyl 1-methylheptalene-4,5-dicarboxylates 5b and 6b derived from 7-isopropyl-1,4-dimethylazulene (=guaiazulen