Tetrahedron Letters p. 6831 - 6834 (1991)
Update date:2022-08-05
Topics:
Liu, Longbin
Katz, Thomas J.
Bromine substituents on benzene rings direct photocyclizations away from their ortho positions.This principle prevents <5>helicenes from photocyclizing and methoxyls from photoeliminating.It makes possible the photosynthesis of <5>helicene and of a tetramethoxy-derivative of <5>helicene.
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