Dimere Naphthochinone, IX. Isodiospyrin und Elliptinon. — Synthese 6,6′-dimerer Bijuglone durch Phenoloxidation
Durch oxidative Kupplung des Naphthols 37b wurde der potentielle Naturstoff 7,7′-Dimethyl-6,6′-bijuglon (5) und in kleinerer Ausbeute Isodiospyrin (21) erhalten. Regiospezifische Synthesen von 5, Elliptinon (10) und 6,6′-Bijuglon (45a) gelangen durch Phenoloxidation geeignet substituierter p-Chlornaphthole. 
 
 
 
Dimeric Naphthoquinones, IX. — Isodiospyrin and Elliptione. — Synthesis of 6,6′-Dimeric Bijuglones by Phenol Oxidation 
 
 
 
Oxidative coupling of the naphthol 37a gave the potential natural product 7,7′-dimethyl-6,6′-bijuglone (5) and, in lower yield, isodiospyrin (21). Regiospecific syntheses of 5, elliptinone (10), and 6,6′-bijuglone (45a) were achieved by phenol oxidation of suitable substituted p-chloronaphthols.