Structure Revision of Wittmann’s Trimeric Condensate from Phenylmalonyl Dichloride. 5H-3,5,7-Triphenylfuro[3,2-b]pyran-2,6-dione from 4-Hydroxy-3,6,7-triphenyl-p-tropoquinone
The structure of saponified product of Wittmann’s trimeric condensates of phenylmalonyl dichloride is revised from 4-hydroxy-3,6,7-triphenyl-p-tropoquinone to 5H-3,5,7-triphenylfuro[3,2-b]pyran-2,6-dione based on the chemical and X-ray crystallographic results.