Abstract
[1,1′;3′,1′′]Terphenyl-4′,5′-dicarboxylic acid derivatives were prepared from 1,3-dienic δ-sultone 4,6-diphenyl-[1,2]oxathiine 2,2-dioxide via Diels-Alder/retro-Diels-Alder reaction with dimethyl acetylenedicarboxylate under thermal, microwave or high-pressure activation.
Acknowledgements
Financial support of this work by the Deutsche Forschungsgemeinschaft and the Rosa-Luxemburg-Foundation is gratefully acknowledged.
Notes
Crystallographic data for the structure 1 have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication number CCDC 693463.