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The crystal structure of (+)-methyl p-tolyl sulfoxide has been solved by the heavy-atom method and refined by Fourier and least-squares techniques. The absolute configuration has been determined by the anomalous phase displacement technique with the sulfur atom acting as the anomalous scatterer. The space group is P212121 with four molecules per unit cell of dimensions a = 5-826 (6), b = 8.621 (8) and c= 16"435 (3) A. Three-dimensional data (Cu Ke) were dollected with a Picker automatic diffractometer. The final R indices obtained for the two configurations are 0.034 and 0.044 respectively, for 832 observed reflections. In the notation of Cahn, Ingold & Prelog the correct absolute configuration at sulfur is R; the same assignment had been made earlier on the basis of chemical evidence.

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Die nucleophile Verdriingung der Alkoxygmppe vom Schwefel in einem Sulfinat mit einem Grignardreagens macht Sulfoxide allgemein zugiinglich; (-)-Menthyl(-)-p-toluolsulfinat (-I) ist -)-Menthyl-(-)-(S)-p-toluols u l b a t ( -I ) [a].[ a h Aceton Rcagens [b]Sulfoxid*

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