Summary
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1.
A study was made of the diene condensation of trans-3-methyl-1,3-pentadiene with maleic anhydride, which proceeds sterically selectively with formation of the cis-cis anhydride (IV), by the thermal isomerization of which the isomeric cis-trans anhydride (VII) was obtained.
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2.
With the aid of stereospecific isomerization reactions of the corresponding monoesters, we prepared all four theoretically possible stereoisomers of 3,4-dimethyl-4-cyclohexene-1,2-dicarboxylic acid (V), (VIII), (XI), and (XIV), the configurations of which were proved by their lactonization.
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3.
In the study of the steric course of the lactonization of the isomeric cis-trans and trans-cis acids (VIII) and (XIV), it was proved that conformations resulting from the rotational isomerism of the cyclohexane ring take part in these reactions.
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Kucherov, V.F., Andreev, V.M. & Nazarov, I.N. Stereochemistry of cyclic compounds. Russ Chem Bull 8, 1022–1030 (1959). https://doi.org/10.1007/BF00916670
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DOI: https://doi.org/10.1007/BF00916670