Download Advances in Theoretically Interesting Molecules (Volume 4: by Randolph P. Thummel PDF

By Randolph P. Thummel

This sequence offers assessment articles relating molecular structures that are of curiosity due basically to the presence of structural good points or features approximately which previous predictions will be in response to current wisdom of chemical conception.

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Chem. , Perkin Trans. 1 1995, 589. Berkowitz, D. -H. Tetrahedron Asymm. 1996, 7, 1577. ; Debaerdemaeker, T. Heterocycles 1986, 24, 297. ; Friedrichsen, W. Tetrahedron Lett. 1987, 28, 4279. ; Friedrichsen, W. Tetrahedron Lett. 1988, 29, 1137. ; Frie&ichsen, W. Tetrahedron Lett. 1988, 29, 2045. ; Friedrichsen, W. a'ebigs Ann. Chem. 1989, 405. ; Friedrichsen, W. Heterocycles 1989, 29, 1003. ; Friedrichsen, W. , B: Chent Sci. 1989, 44, 825. ; Friedrichsen, W. , B: Chem. Sci. 1993, 48, 213. ; Friedrichsen, W.

5. The angularly cyclobuta-fused isomer 141, which loses n-bond order across the bridged bond in going from reactants to transition state, should be more reactive than 1, but is observed to have about the same reactivity. It also is slightly less reactive than the linearly fused isomer 140, although the operation of the Mills-Nixon effect would demand it to be more reactive. Finally, the presence of the electron-donating methyl groups at C5 and C6 leads to a three-fold rate enhancement over IBF, while dibromo substitution as in 142 leads to a two-fold rate reduction.

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