Tetrahedron p. 3347 - 3350 (1989)
Update date:2022-08-16
Topics:
Baran, Janusz
Mayr, Herbert
The hexamethyl substituted bismethylenecyclopentane 1a is 4 to 7 times more reactive towards the acetylenic dienophiles 2 and 3 than the nonmethylated 1,2-bismethylenecyclopentane 1b.This unusual consequence of branching is explained in terms of steric and electronic effects.
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