Diese Zuordnnng wird fur l a noch dadurch gestutzt, dal3 von den Vorzugskonformationen EC und T,4 fiir diastereomere Chalkonhalogenhydrine [5]

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Protonation and Solvation of Weak Organic Bases. III. U.V. and 1H‐N.M.R. Spectroscopic Investigations of the Basicity of 1,3‐Diketones By 1H‐n.m.r. spectroscopy it is possible to determine separately the basicity parameters (H0)1/2 or pK BH ⊕ and the solvation paramters m, ϕ or m* for the keto and the enol form of acetylacetone. By u.v. spectroscopy only brutto parameters of the equilibrium mixture for acetyl‐ and benzoylacetone as for dibenzoylmethane are available.

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