overnight whereupon 12 000 ml of water are added during 15 minutes the organic phase is separated washed with 4 000 ml of n hydrochloric acid followed twice by 4 000 ml of water 4 000 ml of n aqueous sodium hydroxide and water again it is dried filtered and evaporated at 50 u00b0 to yield the 1 u03b1 4 methoxyphenoxy phenylacetyl 4 ethoxycarbonylpiperazine showing in the ir spectrum bands at 1691 1638 and 815 cm 1 to the suspension of 560 g of lithium aluminumhydride in 32 000 ml of diethyl ether the solution of 3 717 g of 1 5 methoxy 2 phenyl 3 benzofuryl 4 ethoxycarbonylpiperazine in 20 000 ml of diethyl ether is added during 2 hours while stirring under nitrogen at 0 u00b0 stirring is continued for 4 hours at 24 u00b0 and 1 000 ml of water are slowly added at 0 u00b0 followed by 500 ml of 3 n aqueous sodium hydroxide the resulting suspension is stirred overnight at room temperature filtered and the residue washed with 8 000 ml of diethyl ether the filtrate is evaporated and 2 838 g of the residue taken up in 16 000 ml of isopropanol the solution is acidified with 750 ml of 12 n ethanolic hydrogen chloride while stirring under nitrogen at 40 u00b0 and stirring is continued for 3 hours at room temperature the precipitate formed is filtered off washed with.