when triethylamine is added the mixture is concentrated in vacuo and applied to a 130 g silica gel column packed and eluted with a 1 1 mixture of ethyl acetate skellysolve b containing 1 triethylamine fractions 26 to 60 are combined and yield the titled product nmr cdcl 3 tms peaks are as follows u03b4 0 80 2 66 m 19h 3 23 s 3h 3 33 3 82 m 2h 3 73 s 3h and 4 46 4 57 m 1h tlc analysis reveals rf 0 22 and 0 26 isomers at c 3 in 50 50 ethyl acetate skellysolve b a 250 ml 3 necked flask is charged with 30 ml of tetrahydrofuran cooled to 0 u00b0 c and 0 18 g of a 60 oil dispersion of sodium hydride is added 1 1 g 4 52 mmole of dimethyl 2 oxo 3 3 dimethylheptylphosphonate in 5 ml of tetrahydrofuran is added the reaction is stirred for 5 min at 0 u00b0 c and 1 hr at room temperature and then cooled to 0 u00b0 c a 250 ml 3 necked flask equipped with nitrogen inlet is charged with 80 ml of methylene chloride and 2 19 ml of pyridine 27 12 mmole.