Bicyclo heptan

GABAA receptor antagonist fiYPNOTICS, SEDATIVES, ANTICONVULSANTS, AND ANXIOLYTICS] (Vol 13) Bicyclo[2.2.1]heptan-2-one [497-38-1]... 

Derivatives of CPD have also been incorporated into these resins. CPD and 2-butene-l,4-diol have been condensed in ethanol and catalyticaHy hydrogenated in situ to give 2,3-bis(hydroxymethyl)bicyclo[2.2.1]heptane (51). This latter compound is used as a chain extender in polyesters for engineering plastics (52). 

Ethylene, bromo-(8) Ethene, bromo- (9) (593-50-2) Bicyclo[3.2.0]heptan-2-ol, 3,3-dimethyl- (9) (71221-67-5) Bis(copper(I) trif1uoromethanesulfonate)benzene complex Copper,... 

Another system in which the factors constrolling the direction of reagent approach has been studied systematically is the bicyclo[2.2.1]heptane ring system. The stereochemistry of a number of reactions of the parent system and the 7,7-dimethyl derivative have been examined.Some of the results are given in Table 3.13. These reactions reveal... 

For enr/o-substituted bicyclo[2.2.1]heptan-7-ones, the following product ratios are observed. Offer an explanation for the substituent effect. 

In some cases, the model that results from building may be severely distorted. For example, using Make Bond to transfonn axial methylcyclohexane into bicyclo[2.2.1 ]heptane (norbornane) gives a highly distorted model (the new bond is too long and the ring has the wrong confonnation). 

Tlie existence of the ylide 19, which can formally be interpreted as the deprotonation product from the corresponding salt 7a, has been claimed by trapping chlorocarbene with pyridine during the laser-flash photolysis of e do-7-chlorodibenzo[n,c]bicyclo[4.1.0]heptane (18) (96JPC18426). Bromination of l-vinyl-2-pyridone (20) yields the bicyclic pyridinium bro-... 

In hydrogen-transfer hydrogenations, various olefinic hydrogen donors are not necessarily equivalent, neither in selectivity nor in rate. The point is illustrated by selected data of Tabor et al. 97) on the transfer hydrogenation of dimethyl bicyclo[2.2,l]heptane-2.5-diene-2,3-dicarboxylate. 

Another common ring system is the norbornane, or bicyclo[2.2.1.)heptane, structure. Like decalin, norbornane is a bicycloalkane, so called because two rings would have to be broken open to generate an acyclic structure. Its systematic name, bicyclo[2.2.1 heptane, reflects the fact that the molecule has seven carbons, is bicyclic, and has three "bridges" of 2, 2, and 1 carbon atoms connecting the two bridgehead carbons. 

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