spectra were measured on a varian unity inova 300 or 400 spectrometer for examples which show the presence of rotamers in the proton nmr spectra only the chemical shifts of the major rotamer are quoted ms spectra were obtained on finnigan mat ssq7000 or a micromass platform spectrometer to a two phase mixture of palladium acetate 1 7 g lithium acetate dihydrate 123 6 g lithium chloride 30 0 g manganese iv oxide 15 3 g and p benzoquinone 1 4 g in acetic acid 250 ml water 420 ml and pentane 3 7 l was added spiro 2 4 hepta 4 6 diene 7 7 g and the resulting mixture was stirred at ambient temperature for 24 hours the reaction mixture was filtered through a celite plug washing with pentane 1 l the organic phase was collected washed successively with saturated sodium bicarbonate solution 500 ml water 500 ml and brine 100 ml then concentrated to dryness under reduced pressure the residue was absorbed onto silica and purified by chromatography sio 2 9 1 isohexane ethyl acetate to afford the subtitle compound 2 1 g nmr u03b4h cdcl 3 6 25 2h s 5 25 2h s 2 07 6h s 1 01 2h t j 8 hz 0 85 2h t j 8 hz to a solution of palladium u03c0 allyl chloride dimer 80 mg and u2212 1 2 bis n 2 u2032 diphenylphosphino benzoyl 1 s 2 s diaminocyclohexane 600 mg in anhydrous tetrahydrofuran 25 ml under nitrogen was added a solution of the product.