References
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- 1970 . J. Org. Chem. , 35 : 2849 The term cis refers to diequatorial positions of 4-methyl and the senior exocyclic group on phosphorus, as determined by the sequence rule, while trans refers to equatorial -axial relationship between these two groups
- 31P NMR spectra were recorded on Jeol JNM FX-60 (24.2 MHz) instruments. Negative values were assigned for compounds absorbing upfield from 85% H3PO4
- The reaction of diastereomeric mixture of 2-chloro-2-oxo-4-methyl-1,3,2-dioxaphosphorinanes with sodium and benzanilide led to the mixture of products absorbing in 31P NMR at -7.9 ppm, -11.8 ppm, -17.8 ppm, which proves that under applied spectroscopic conditions6 diastereomers of 4 are indistinguishable
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