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The 220 MHz  1 H-NMR-Spectrum of a spirocompound was analysed in terms of an ABCDX Spinsystem.  4 J POCH ,  3 J HH , δ H  and δ p  were obtained and used to determine the geometry of the molecule. The spirocompound seems to have a rigid double-chair-conformation of C 2 -symmetry.

zeitschrift für naturforschung b

Anwendung der 220 MHz Protonenresonanz-Spektroskopie zur Konformationsanalyse: 3.9-Dichloro-3.9-dithiono-2.4.8.10.3.9-tetraoxadiphospha-spiro(-6-)-undecan ein Spirocyclus mit zwei Dioxaphosphorinan-Ringen: Application of 220 MHz Protonresonance-Spectroscopy for Conformation-Analysis