17159-75-0Relevant academic research and scientific papers
Regioselectivity in Ring-Expansion of 1-Substituted Bicyclohexan-2-ones: Preferential Migration of Methylene Over Bridgehead Carbon
Della, Ernest W.,Pigou, Paul E.
, p. 2261 - 2268 (2007/10/02)
Ring expansion of several 1-substituted bicyclohexan-2-ones has been investigated in order to compare the effect od substitution on the migratory aptitude of the bridgehead carbon in relation to the methylene carbon.In the cases examined it was observed that there is a marked preference for migration of the methylene carbon, with the substituted substrates displaying higher regioselectivity that the parent ketone.In the rearrangement of both 1-fluoro- and 1-chloro-bicyclohexan-2-one, migration of the methylene carbon occurs exclusively.
Desaminierungsreaktionen, 34. Diels-Alder-Reaktionen mit Methoxycyclopentadien, ein Weg zu 1-Methoxynorbornan-2-diazonium-Ionen
Kirmse, Wolfgang,Loosen Karin
, p. 400 - 404 (2007/10/02)
A mixture of 1- and 2-methoxycyclopentadiene (7, 8) was prepared in four steps from cyclopentadiene.Diels-Alder reaction of 7 + 8 with methyl acrylate produces a mixture of adducts from which the 1-methoxy isomers (9, 11) were obtained by distillation.Separation by way of the iodo lactone 20, hydrogenation, and Curtius degradation afforded endo- and exo-1-methoxy-2-norbornylamine (14, 17).Nitrous acid deamination of 14 yielded norpinan-2-one (21) and norbornan-2-one (22) in a 3:7 ratio whereas 17 gave 22 only.The results of the deamination reactions confirm the position of the methoxy groups and illustrate the superiority of diazonium precursors in the norbornane - norpinane rearrangement.
