was lowered to 1 2 by means of 12n hcl the toluene phase separated and washed with water 1 u00d7 2 liters and saturated aqueous sodium chloride solution 1 u00d7 1 liter it was then dried mgso 4 and concentrated in vacuo at 45 u00b0 50 u00b0 c internal temperature yield 757 g 98 of product as an oil under a nitrogen atmosphere a mixture of p toluene sulfonic acid monohydrate 1 0 g 5 3 mmoles racemic 5 phenyl 2 pentanol 292 g 1 78 moles and phthalic anhydride 263 g 1 78 moles was heated at an internal temperature of 95 u00b0 98 u00b0 c for 2 hours it was then cooled to room temperatue to give a quantitative yield of the title product as a clear viscous oil ester prepared by this procedure was used directly in the procedure of example 6 a mixture of racemic 5 phenyl 2 pentyl hemiphthalate 720 g 2 305 moles brucine 901 g 2 29 moles and acetonitrile 4 liters was stirred at ambient temperature for 5 minutes and then at 80 u00b0 82 u00b0 c for 5 minutes to give a clear solution isopropyl ether 11 6 liters was then added to the solution over a 15 minute period while maintaining the internal temperature at 64 u00b0 c the resulting cloudy solution.