Synthesis and separation of atropisomers of 9,10-dipivaloylanthracene and 9,10-bis(1-imino-2,2-dimethylpropyl)anthracene. Structural study by NMR, molecular mechanics, and x-ray diffraction

摘要

Cicolid and transoid conformations of 9,10-dipivaloylanthracene and 9,10-bis(1-imino-2,2-dimeth- ylpropyl)anthracene were separated and detected for the former and isolated for the latter at room temperature. The transformation between two atropisomers was studied by NMR and modeled by MM methods. X-ray diffraction was performed for the imino derivatives.