Strained Cycloallenes And Silver Ion Assisted And Unassisted Solvolysis Of Some N,N-Dibromobicyclo(N-3.1.0)Alkanes
The strained cyclic allene intermediates of 1,2-cyclohexadiene, 1,2-cycloheptadiene and 1,2-cyclooctadiene have been successfully generated by the debromination of their corresponding 2,3-dibromocycloalkenes. Evidence for their intermediate existence was obtained by trapping them with the Diels-Alde...
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| Format: | Others |
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Scholarly Commons
1969
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| Online Access: | https://scholarlycommons.pacific.edu/uop_etds/2853 https://scholarlycommons.pacific.edu/cgi/viewcontent.cgi?article=3852&context=uop_etds |
| Summary: | The strained cyclic allene intermediates of 1,2-cyclohexadiene, 1,2-cycloheptadiene and 1,2-cyclooctadiene have been successfully generated by the debromination of their corresponding 2,3-dibromocycloalkenes. Evidence for their intermediate existence was obtained by trapping them with the Diels-Alder trapping agent 2,5-diphenyl 1-3,4-benzofuran and by isolating the corresponding addition products.
The goal of this study was to generate the transitory cyclic allenes 1,2-cyclooctadiene, 1,2-cycloheptadiene and 1,2-cyclohexadiene and to investigate some aspects of their chemistry. Evidence for the intermediate existence of these strained cyclic allenes has been found by generating them by the debromination of their corresponding 2,3-dibromocycloalkenes and by trapping the generated cycloallene intermediates with the Diels-Alder trapping agent 2,5-diphenyl-3,4-benzofuran.
In order to carry out this study, it became necessary to synthesize 2,3-dibromocyclooctene and 2,3-dibromocycloheptene. 2,3-Dibromocyclohexene had been previously prepared. The synthetic sequence employed to obtain these compounds is summarized by Equations 2 and 3. |
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