1032 
position 6. Likewise the reaction constant of 1,3,4 is considerably 
greater than that of 1,4. | 
The reaction constants with diethvlamine were determined with 
the proportion of 1 mol. of nitro-dichlorobenzene to 2 and to 10 
mols. of diethylamine, which did not yield quite the same values 
for those constants. In table III the values found are united. The 
time has again been recorded in hours. NO, = 1. 
TABLE Ill. 
85° | 110° 
Isomeride 
aa Wie ae Bete Beg | ise 4) Bi 
| | 
1,2,3 | 0.0023 | 0.0016 | 0.0094 | 0.0073 
1,2,4 | 0.025 | 0.027 0.12 | 0.095 
1, 2,5 | 0.0068 0.0067 0.032 0.023 
1,26 | = 0.00024 — | 0.0011 
1,3,4 | 0.0052 0.0044 | 0.020 | 0.017 
1,2 a 0.0014 a 0.0053 
1,4 | 
— 0.00065 | — | 0.0024 
The impression made by this table is in the main the same as 
that of table I]. Also here the reaction constants of the two vicinal 
isomerides are considerably smaller than those of the other nitro- 
dichlorobenzenes and that for the isomeride 1,2,6 is also the smallest. 
The isomeride 1,2,4 has also here the greatest reaction constant but 
now this is not followed up by that of 1, 3,4 as in the case of the 
methoxide reaction; presumably this is connected with the fact that 
the reaction constant for 1,4 with diethylamine is smaller than that 
of 1,2, whereas with methoxide this is just the reverse. That, however, 
also in the other cases which run parallel, there can be no question 
of a constant relation between the reaction constants with methoxide 
and with diethylamine may be seen at once from table IV. p. 1033. 
Not only are the figures in a same column very divergent, but 
the corresponding figures of the two columns differ very much; 
those at 110° are all about twice greater than those at 85°, which 
indicates that the reaction velocity for methoxide increases much 
more rapidly with the temperature than that for diethylamine. 
Table V gives the figures as to the influence of the temperature 
on the reaction constant. Whereas the ratios for methoxide on the 
