The protection of the carbonyl group of 2, 2, 6, 6-tetramethyl-l-phenylphosphorinan-4-one as the ethylene ketal, reductive removal of the 1-phenyl substituent with lithium metal in THF, and subsequent removal of the protecting group followed by hydride reduction gave 5. A mild two-phase procedure for the oxidation of 1H-phosphorinanes to 1-oxo-1H- phosphorinanes is described. The'H NMR spectrum of 5 suggests that the ring has a ...
![7,7,9,9-tetramethyl-8-phenyl-1,4-dioxa-8-phosphaspiro[4.5]decane Structure](https://image.chemsrc.com/caspic/336/90839-17-1.png)