Abstract
Preparation and properties of the planar-chiral [2.2]phanes 1a – d and of the sulfone 2c are described. The enantiomers of the ester 1c have been separated on triacetylcellulose. The circular dichroism and the racemization barrier for the enantiomers have been determined. The X-ray analysis of 1c for the first time gives precise data on the spacial relationships in ...
Abstract
Preparation and properties of the planar-chiral [2.2]phanes 1a – d and of the sulfone 2c are described. The enantiomers of the ester 1c have been separated on triacetylcellulose. The circular dichroism and the racemization barrier for the enantiomers have been determined. The X-ray analysis of 1c for the first time gives precise data on the spacial relationships in 1,10-dithia[2.2]metacyclophanes. Comparisons with the corresponding hydrocarbon skeleton 3 lead to conclusions as to the topomerization barrier in substituted [2.2]phanes dependent on the distance of the intraanular substituents.
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