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2. Dissertation Technische Hochschule Darmstadt can be easily dehydrated into the dimethylheptalene;Hock;Tetrahedron Lett,1991
3. therein;Houk;Chem,1992
4. similar effect was observed in the case of the bondshift isomers of dimethyl heptalene dicarboxylates ter;Hafner;Chem Chem Int Ed Engl,1985