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Upper rim through the annulus

Two pathways are available to a calixarene for conformational inversion. One involves the upper rim through the annulus and the other involves the lower... [Pg.68]

In the calix[5]arenes it is not yet known whether the p-H compound can engage in upper rim through the annulus conformational inversion, but it seems quite certain that the p-tert-buty compound cannot do so at temperatures ordinarily encountered in laboratory procedures. As anticipated, larger OR groups are necessary to curtail conformational interconversion of calix[5]arenes than for the calix[4]arenes it has been determined that the threshold size requires a group slightly more bulky than n-butyl (AG of penta-n-butyl ether of 51-Bu jYioP for ethers and n-butanoyl (AG for penta-n-butanoate of... [Pg.69]

See other pages where Upper rim through the annulus is mentioned: [Pg.69]    [Pg.69]    [Pg.69]    [Pg.70]    [Pg.69]    [Pg.69]    [Pg.69]    [Pg.70]    [Pg.73]    [Pg.838]    [Pg.410]    [Pg.651]    [Pg.762]    [Pg.771]   


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Annulus

Upper rim

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