Organic chemical compounds exhibiting atropisomerism are important substances for investigating intermolecular interactions. They also demonstrate very interesting anomalities in reactivity of diastereotopic groups. This monograph is of particular interest to physical and to synthetic organic chemists. The author has investigated two particular classes of compounds that have stable rotational isomers at room temperature.

Inhalt
1 Introduction.- 1.1 The Free Rotation Concept.- 1.2 Recognition of Rotational Isomers.- 1.3 Atropisomers.- 1.4 Isolation of Rotational Isomers.- 1.5 Concepts That Need Modification.- 1.6 References.- 2 Rotamer Populations.- 2.1 Estimation of Rotamer Populations.- 2.2 Factors That Affect Rotamer Populations.- 2.3 Information on Molecular Interactions Obtained from Rotamer Populations.- 2.4 References.- 3 Barriers to Rotation.- 3.1 Estimation of Barriers to Rotation.- 3.2 High Barriers to Rotation in the 9-Arylfluorene Series.- 3.3 High Barriers to Rotation in 9-Substituted Triptycene Series.- 3.4 High Barriers to Rotation in Miscellaneous Compounds.- 3.5 References.- 4 Reactivity of Rotational Isomers.- 4.1 Reactivity of 9-Arylfluorenes.- 4.2 Reactivity of Substituted Triptycenes.- 4.3 References.