Studies in mass spectrometry. Part XIV. The effect of conformation on the electron impact-induced fragmentation of adducts of p-benzoquinone and 1,1′-bicycloalkenyls
作者:Joseph Deutsch、Asher Mandelbaum
DOI:10.1039/j29710000886
日期:——
Electron impact-induced doublehydrogenmigration leading to the formation of ions a from adducts of p-benzoquinone and 1,1′-bicycloalken-1-yls has been found to be suppressed when the sizes of rings C and D of the adducts are increased. This effect is explained in terms of different distances between the migrating hydrogen atoms and the carbonyl groups, which are affected by the conformations of the
The pinacol rearrangement of cyclopentylcycloheptane-1,1'-diol
作者:R.D. Sands
DOI:10.1016/0040-4020(65)80024-2
日期:1965.1
When cyclopentylcycloheptane-1,1'-diol was heated with dilute acid, the major product was spiro [5.6] dodecan-1-one. The diene, 1-(1-cyclopentenyl)cycloheptene, was a minor product, and no spiro [4.7] dodecan-6-one was found.
Study of I-Strain Relief in the Intermediate When Forming Spiro Ketones from Unsymmetrical Cycloalkylidenecycloalkanes, Their Dibromides, and Their Pinacols
作者:Richard D. Sands
DOI:10.1021/jo00081a030
日期:1994.1
Three unsymmetrical intercyclic olefins, their dibromides, and their pinacols were prepared, each so the two carbons involved at the functional group were part of a different sized ring. The pinacols were reacted with 25% sulfuric acid and with boron trifluoride etherate, the dibromides with silver nitrate,and the olefins with mercuric acetate and with trifluoroperacetic acid. The predominant spiro ketone found in each product mixture was used to determine which carbon, and hence which size ring, could better undergo the sp(3) to sp(2) or the sp(2) to sp(3) transition. The findings were consistent with Brown's observations on ring strain.
ISABELLE M. E.; LAKE D. H.; WIGHTMAN R. H., CAN. J. CHEM., 1977, 55, NO