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Hemiketals conformation

The force field calculations of the enthalpies (AAiT) of the four hemiketals of 6-methylpyrano[2,3-/ ]dioxane-8a-ols clearly indicate that the /3-m-fused link is the most favored, followed by the a-cis- and /3-/ra r-isomers, while the a-/ra r-compound, due to the pyranoid ring being forced into 4 conformation with an axial methyl group, is the least likely to be formed <1991MI235>. [Pg.765]

Studies of Equilibria, Configuration and Conformation. - Alcoholic solutions of acylphosphonates have been shown to contain considerable amounts of hemiketals by examination by P NMR spectroscopy. Because of the great difference between the P chemical shifts of acylphosphonates (831 0) and their hemiketals (63ip= 17-21), P NMR spectroscopy was shown to be a suitable method for studying the rates and equilibrium of hemiketal formation of acylphosphonates with different alcohols. [Pg.311]

See other pages where Hemiketals conformation is mentioned: [Pg.1216]    [Pg.1216]    [Pg.433]    [Pg.255]    [Pg.99]    [Pg.11]    [Pg.333]    [Pg.16]    [Pg.80]    [Pg.3]    [Pg.144]    [Pg.147]    [Pg.320]    [Pg.57]    [Pg.11]    [Pg.1593]    [Pg.360]    [Pg.91]    [Pg.954]    [Pg.88]    [Pg.87]    [Pg.60]    [Pg.294]    [Pg.346]    [Pg.340]    [Pg.296]    [Pg.918]    [Pg.33]   
See also in sourсe #XX -- [ Pg.472 ]



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Hemiketal

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