Study of I-Strain Relief in the Intermediate When Forming Spiro Ketones from Unsymmetrical Cycloalkylidenecycloalkanes, Their Dibromides, and Their Pinacols
摘要:
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.
Study of I-Strain Relief in the Intermediate When Forming Spiro Ketones from Unsymmetrical Cycloalkylidenecycloalkanes, Their Dibromides, and Their Pinacols
摘要:
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.
(EN) Hydrocarbon fuels, for example straight run gasoline and cat-cracked spirit, are up-graded by reacting the fuel with a hydrocarbyl hydroperoxide at a temperature greater than the decomposition temperature of the hydroperoxide and at a pressure sufficient to maintain the reactants in the liquid phase. The reaction may be carried out in the presence or absence of a metal catalyst for the decomposition of the hydroperoxide and optionally in the presence of a solid not generally regarded as a hydroperoxide decomposition catalyst, e.g. alumina, silica or silica-alumina. (FR) La qualité de combustibles d"hydrocarbures, par exemple de l"essence produite directement par distillation de pétrole brut, ou une essence obtenue par craquage catalytique d"un hydrocarbure lourd, est améliorée en faisant réagir le combustible avec un hydropéroxyde d"hydrocarbyle à une température supérieure à la température de décomposition de l"hydropéroxyde et à une pression suffisante pour maintenir les réactifs dans la phase liquide. La réaction peut se dérouler en présence ou en l"absence d"un catalyseur métallique pour la décomposition de l"hydropéroxyde et, éventuellement, en présence d"un solide pas toujours considéré comme un catalyseur de décomposition de l"hydropéroxyde, par exemple l"alumine, la silice ou la silice-alumine.
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.