Review
doi: 10.1021/ar000165c.
Photoisomerization by hula-twist: a fundamental supramolecular photochemical reaction
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- PMID: 11456473
- DOI: 10.1021/ar000165c
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Review
Photoisomerization by hula-twist: a fundamental supramolecular photochemical reaction
Acc Chem Res.
2001 Jul.
Abstract
The volume-conserving hula-twist cis/trans isomerization process has been incorporated in a general scheme for photoisomerization of polyenes, applicable to small organic molecules as well as to protein-bound polyene chromophores. The main theme is that in solution the conventional one-bond-flip mechanism dominates, while in frozen media (or under other forms of supramolecular constraint) the hula-twist mechanism takes over. Literature examples of photoisomerization obtained under confined conditions have been critically reviewed, the applicability of HT has been examined, and new systems unambiguously testing this volume-conserving process are proposed.
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