( 265 ) 



2. ,372.8 mgrs. treated as directed; Pipetted off 35.44s grams oi 

 solution which required 14.51 cc. of alkali tor neutralisation. 

 Main product 92.8%; byeproduct 7.2°/ . 



III. Nitration of wi-bromobenzoic acid at 0'. 



5 grams treated with 30 grams of absolute nitric acid. 



Mol. weight of the nitration product 24.3.7. 



Weighed 424.0 mgrs. of the product ; shaken with 100 mgrs. or 

 byeproduct and 100 grams of water at 25 . Pipetted off 33.945 grams 

 which required 12.19 cc. of alkali for neutralisation. 



Main product 88.3%; byeproduct 11.7%. 



IV. Nitration of wi-bromobenzoic acid at 30°. 

 Mol. weight 243.4. 



374.4 mgrs. treated as directed. Pipetted off 31.661 grams of 

 liquid which required 9.91 cc. of alkali for neutralisition. 



Main product 88.6%; byeproduct 11.4%. 



Mr. Polak has repeated these investigations with great care in 

 which he used material prepared by himself. In order to be sure 

 that the nitration products did not retain any nitric acid they were 

 analysed in the manner described, after the test with dipheriylamine 

 had become negative. The remainder of the preparation was then 

 agaiir triturated and washed with cold water; the dissolved organic 

 acids were recovered from the washings and the preparation thus 

 purified was again submitted to analysis. The two analyses are 

 indicated with I and II. 



CI 0°. M.W. 202,9 (201,5). 



I 0,3374 gr. of nit. mixture 1 94.333 gr. of 16.39 cc. of (0.0922) n Tot. sol. 0.328 

 -4-100 mgr. of a in 100 cc. I sol. 0.3104 alkali 92.97, « 8.0% 



II 0,3315 gr. of nit. mixture I 45.516 gr. of 7.28 cc. of (0.0922) n Tot. sol. 0.3180 

 4-100 mgr. of* in lOOcc. I sol. 0.3053 alkali 92.1% x = 7.9% 



CI -30° M.W. 203.8 (201.5). 

 I 0.3410 gr. of ( 98.157 gr. of 17.43 cc. of 1 0.0922) n alkali Tot. sol. 0.3300 

 nitr. mixture \ sol. : 0.3181 = 93.3 ° . '„ * ■ 6.7 '/„ 



II 0.3275 gr. of / 66.284 gr. of 11.40 cc. of (0.0922) n alkali Tot. sol. 0.3195 

 nitr. mixture \ sol. /3 0.3068 = 93.7 % x : 6.3 % 



Br 0° M.W. 245.7 (246). 

 I 0.3320 gr. of 1 55.477 gr. of 7.32 cc. of (0.0922) n alkali Tot. sol. 0.2993 



nitr. mixture \ sol. (3 0.2898 = 87.0% 2: 13.0% 



II 3292gr.of ( 67.915 gr. of 8.96 cc. of (0.0922) n alkali Tot. sol. 0.2071 



nitr. mixture \ sol. (3 0.2868 = 87.1% u. = 12.9% 



Br. -30°. M.W. 245.2 (246). 

 I 0.4585 gr. of J 89.965 gr. of 16.48 cc. of (0.0922) «alkali Tot. sol. 0.4155 

 nitr. mixture j sol. = 0.4096 0:89.3% a: 10.7% 



II 0.4385 gr. ol , 64.190 gr. of 1 1.20 cc. of (0.0922) M alkali Tot. sul. 0.3957 

 nitr. mixture j sol. 0:0.3192 0:89.2% «:10.8% 



