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The Photochemical cis–trans Isomerization of Free Stilbene Molecules Follows a Hula‐Twist Pathway
Author(s) -
Fuß Werner,
Kosmidis Constantine,
Schmid Wolfram E.,
Trushin Sergei A.
Publication year - 2004
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200454221
Subject(s) - isomerization , twist , molecule , chemistry , stereochemistry , photochemistry , organic chemistry , catalysis , mathematics , geometry
A motion breaking with tradition : The cis–trans isomerization of nonpolar conjugated π systems does not proceed simply by the 180° twist of a CC bond (“one‐bond flip”, OBF), but by the rotation of a central CH group out of the plane (“hula twist”, HT). The hula‐twist motion does not require any external constraint but is driven by an internal force: the slope on the way through a conical intersection.