Rotation about the Carbon-Carbon single bond is generallyregarded to be unrestricted. About 50 years ago, rotationalisomers were found to exhibit optical activity: substitutedbiphenyl derivatives.From the contents: The "Free Rotation Concept" - RotamerPopulations - Barriers to Rotation - Reactivity ofRotational Isomers.
The appearance of the first review in 1965 [1] and the first monograph in 1968 [2] on chemiluminescence demonstrated the extent of the phenomenon of light emission from the reaction of organic compounds in solution.
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