Abstract
The molecular structure of t-butyl-phenylphosphinic acid (−)-menthyl ester (1e S) has been determined by X-ray analysis and the results compared with the findings of a detailed NMR-study. 1e S crystallises in the monoclinic space group P2 1 with a = 9.304(2), b = 10.678(4), c = 12.681(4) Å, β = 124.91(1)°, Z = 2, D x = 1.08 g cm −3. The structure was refined to R = 0.035 for 1842 independent reflections. The absolute configuration was confirmed as S (p). Both methyl functions of the menthyl-iso-propyl substituent take up positions close to the phenyl ring system.
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