✍ Scribed by Morgenthaler, Jens ;Rüchardt, Christoph
No coin nor oath required. For personal study only.
1,3‐Cyclohexadiene, 1,3‐cycloheptadiene and cycloheptatriene are smoothly hydrogenated to cyclohexene and cycloheptene, respectively, when heated to 260–340°C with an excess of 9,10‐dihydroanthracene (DHA) in diphenyl ether or benzonitrile. On the basis of a mechanistic study a nonchain three‐step mechanism is proposed which is initiated by a transfer of a hydrogen atom from DHA to the polyenes (retrodisproportionation).
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## Abstract From the uncatalyzed transfer‐hydrogenation of azulene 1 with the hydrogen donors 9,10‐dihydroanthracene (4), 7__H__‐benz[__de__]anthracene (5) and 9,9‐diphenyl‐10,10‐dideuteroanthracene (6) at 340–375°C in diphenyl ether, two isomeric octahydroazulenes and, in addition, naphthalene and
## Abstract The mechanistic alternatives in the literature for quinone dehydrogenations of hydroaromatic to aromatic hydrocarbons are reviewed. In a kinetic study of the reaction of DDQ 16 with 9,10‐dihydroanthracene (13) or xanthene (17) small solvent effects and small rate differences between 13
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