extracted with methylene chloride several times the methylene chloride solution was dried concentrated to an oil at reduced pressure and the oil was distilled at 70 u00b0 75 u00b0 500 u03bc to obtain 46 9 g 85 of colorless u00b1 trans 2 phenylcyclopropylamine 688 55 g 4 58758 m of u00b1 tartaric acid was dissolved in 3400 ml of absolute ethanol the solution was cooled in an ice bath and stirred vigorously 611 g 4 58743 m of u00b1 trans 2 phenylcyclopropylamine was added as an oil 75 ml of absolute ethanol was used to rinse the residual amine in the flask and this was added to the main portion immediately the reaction was exothermic and very soon the diastereomeric salts precipitated out the mixture was cooled and filtered to yield 1280 g 98 5 of diastereomeric tartrates after drying under high vacuum the white powder was recrystallized four times from isopropanol water 75 25 to give white crystals the technique followed was to get as concentrated a solution as possible while maintaining a clear solution at 70 u00b0 75 u00b0 c the solution was allowed to cool slowly at room temperature and then just before filtration was cooled in an ice bath generally four or five crystallizations were necessary to get complete resolution which was indicated by the appropriate melting point and specific rotation of the salt yield of the amine tartrate was 360 g 56 25 m p 189 u00b0 191 u00b0 specific rotation u03b1 d 25 30 1 u00b0 c 0 0353 m 1 water 360 g of the salt obtained above was made basic to ph 12 with 60 koh and the cloudy solution was extracted with ether the combined ether extracts were washed with water.