1.1: sodium hydroxide; sodium tetrahydroborate; (ethylenedinitrilo)tetraacetic acid disodium salt / water / 25 - 92 °C 1.2: 0 - 10 °C / pH 9 2.1: hydrogenchloride / water / 1 h / 5 - 30 °C / pH 3.2-3.4 3.1: water / 25 - 70 °C 4.1: water / 25 - 70 °C / |Resolution of racemate 5.1: hydrogenchloride / water / 25 - 30 °C / pH 5 - 7.6 View Scheme