1. 8-oxoheptafulvene. II The reaction with benzophenone and tropones
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3. We found that the reaction of 2-methoxytropone and its derivatives also gave methoxyheptafulvalenes in a better yields together with oxaazulanone derivatives. The results will appear elsewhere
4. We thank Dr. T. rlachiguchi, Saitama University, for donation of 2, 3-benzotropone
5. Zur Kenntnis der Ketene. Über die Reaktionsfähigkeit des Carbonyls