EXPERIMENT AL,. 



73 



The alanine, when recrystallized by dissolving in a little hot water and 

 gradually adding alcohol, decomposed at about 290. 



Carbon and hydrogen: 0.2404 gram substance, dried at 110, gave 0.3571 gram CO 2 and 



0.1712 gram H 2 O. 



Nitrogen: o. 3980 gram substance gave NH 3 = 6. 2 cc. HC1 (i cc. HCl = o.oi gram N). 

 Calculated for C 3 H 7 O 2 N, C 40.40, H 7.93, N 15.75 p. ct.; found, C 40.51, H 7.91, 



N 15.58 p. ct. 



f Fraction II. Temperature of bath up to 100. 

 (Pressure, 12 mm. Weight, 83.84 grams. 



Distillations A and B. Bach was saponified by 

 5 parts of water. 



The solution was evaporated to dry ness under fWuced^ i^HBure, the dried 

 residue boiled up with absolute alcohol, and 13.37 gram^^ere dissolved. 

 This solution was united with a similar one obtained from fraction III. 

 The substance, insoluble in alcohol, after systematic fractional crystalliza- 

 tion, gave 



(I) 22.1 grams of leucine, which decomposed at about 298 and had the 

 following composition : 



Carbon and hydrogen: 0.3128 gram substance, dried at rio, gave 0.6310 gram CO 2 and 



0.2794 gram H 2 O. 

 Calculated for C 6 H 13 O 2 N, C 54.89, H 10.01 p. ct.; found, C 55.01, H 9.92 p. ct. 



(II) A fraction of 3.45 grams which by fractional crystallization could 

 not be further separated and gave results on analysis which agreed best for 

 a mixture of leucine and amino-valerianic acid. 



Carbon and hydrogen : 0.2857 gram substance, dried at 110, gave 0.5519 gram CO 2 and 



0.2577 gram H 2 O. 

 Calculated for equal molecules of leucine and amino-valerianic acid, C 53.05, H 9.74 



p. ct.; found, C 52.68, H 10.02 p. ct. 



(III) 2.1 grams substance which had^he properties and composition of 

 amino-valerianic acid. 



, dried at 110, gave 0.3957 gram CO 4 

 tance, dried at 110, gave 0.8643 gram 



.; found, (I) 



.03, H 9.82 p. ct.; 



Carbon and hydrogen: (I) 0.2115 gram sub 



and 0.1870 gram H 2 O ; (II) 0.4597 gra: 



CO 2 and 0.3956 gram H 2 O. 

 Calculated for C 5 H U O 2 N, C 51.22, H 9. 



(II) C 51-27, H 9.56 p. ct. 



Specific rotation. Dissolved in 20 per cent hydrochloric acid? () -^-.=^ 



+ 25.79. E. Fischer and Dorpinghaus 1 found + 25.9 for their preparation 

 from horn, and Schulze and Winterstein* found +28.2 and +27.9 for 

 preparations from lupine seedlings. 



1 Fischer & Dorpinghaus, Zeitschrift fur physiologische Chemie, 1902, 

 * Schulze & Winterstein, ibid., 1902, xxxv, p. 300. 



. 462. 





