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I -= Me or Ph) were prepared and ozonized at -78°C to give diketones in good yield. The intramolecular aldol condensation was performed on certain o f these ketones to give multicyclic 3-phosphorinone derivatives. I n some cases, double-bond rearrangement into the ring-f'usion position was encountered. The I-phenyl derivative in the benzophosphindole series could not be cyclized due to ready displacement of the P fragment from the tetralone system. The diketones reacted with ammonium acetate to give multicyclic derivatives of the 1,4-dihydro-l,4-azaphosphinine ring system. 1,2,3,4,5,6,7,8-0ctahydro-3-oxo-l -phenylphosphinoline I-oxide was used to demonstrate the value o f the bicyclic 3-phosphorinones as precursors of I-phosphadecalone derivatives. The carbonyl group was protected as the ethylene ketal and the double bond (as well as the benzene ring) was hydrogenated with ease. Hydrolysis gave the l-phospha-3decalone derivative. Reduction o f the same 3-phosphorinone with NaBH4 gave a mixture of diastereomeric alcohols.

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