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Solvent-dependent stereoselectivity of bis-2-pyridone [4 + 4] photocycloaddition is due to H-bonded dimers
1Department of Chemistry, State University of New York, Stony Brook 11794-3400, USA. ssieburth@sunysb.edu
Organic Letters
|June 3, 2000
Abstract:
[formula: see text] A solvent-dependent stereoselectivity found for intramolecular [4 + 4] photocycloaddition of tethered 2-pyridones is concentration dependent, indicating that a dimeric structure with four hydrogen bonds plays a critical role in the observed cis selectivity found for nonpolar solvents.