UV-spectroscopic study of complex formation by certain cycloolefins with tetracyanoethylene and molecular iodine
摘要:
UV spectroscopy of charge-transfer complexes (CTCs) with tetracyanoethylene (TCE) and iodine has been used to study the relative donor ability of mono- and bicycloolefins and the stability of the CTCs. The donor ability of bicycloolefins, characterized by v(CT)(TCE), increases with increase in ring strain. The equilibrium constants for complex formation of bicycloolefins with TCE are linearly related to the rate constants of the reaction of epoxidation by tert-butyl hydroperoxide.
Synthesen in der Isocamphanreihe, 39. Mitt.: Verbesserung derDiels-Alder-Reaktion von Cyclopentadien mit Mesityloxid durch Ultraschall und eine neue Synthese von Dehydrocamphen
摘要:
The synthesis of the valuable terpenic synthon 2-acetyl-3,3-dimethylbicyclo[2.2.1]hept-5-tene is clearly improved concerning the yield and especially the reaction time by applying ultrasound on the Diels-Alder reaction of cyclopentadiene with mesityl oxide. A new synthesis of dehydrocamphene and its odour impression is described.