3,8-Bis(trimethylsiloxy)-6-bromo-6,7-dihydro-1-phenyl-1H-phosphonin 1-oxide and its conversion to a phosphonin oxide and a cyclopenta-.lambda.5-phosphorin
3,8-Bis(trimethylsiloxy)-6-bromo-6,7-dihydro-1-phenyl-1H-phosphonin 1-oxide and its conversion to a phosphonin oxide and a cyclopenta-.lambda.5-phosphorin