Baran, Janusz; Klein, Herbert; Schade, Christian; Will, Elfriede; Koschinsky, Rainer; Bäuml, Englbert; Mayr, Herbert
Synthesis of 1,1,2,2,3,3-hexamethyl-4,5-bis(methylene)cyclopentane.
In: Tetrahedron, Vol. 44, No. 8: pp. 2181-2184
An efficient synthesis of the title compound 14 is reported, which employs the ZnCl2/Et2O catalyzed addition of acetyl chloride (4) to 2-methyl-2-butene (5) and the [3+ + 2] cycloaddition of the 1,1,2,3-tetramethylallyl cation to 2,3-dimethyl-2-butene as key steps.