Ammonium thiocyanate was prepared in 2 steps from aqueous ammonia and carbon disulfied by phase transfer catalysis in yield of 72 7%, when catalysts consisted of OP 4 and OP 21 in mole ratio of 4∶6. The effects of reaction temperature, time, mole ratio of OP 4 to OP 21 and conparison with other catalysts on the reaction were descurved.
L Alanine crystal with the same optical purity ([ α ] 25 D=+1 98) as that of the seed L alanine crystal has been obtained from saturated solution of DL α alanine by seed crystal resolution method. Addition of surfactant(OP series) in culture fluid accelerated the crystallization of L alanine .
