331 E. W. Dean — Esters of Substituted Aliphatic Acids. 



in sealed tubes at about ninety degrees. The completion of 

 the reaction was in this way assured. 



Calculations were made by the use of the well-known titra- 

 tion formula* for reactions of the first order. In the tables 

 are given values of the constants obtained and of the periods 

 in minutes over which the courses of the various reactions 

 were followed. Bracketed constants are not counted in the 

 averages; their irregularity being undoubtedly caused by undue 

 experimental error. 



Table I. 

 Hydrolysis at 25°. N/10 HC1. 



Ethyl Ethyl Ethyl a- Ethyl a-Oxy- Ethyl /?- 



Ester ] 



3utyrate Is 



3 -baity rate 



Oxy-butyrate I 



30-butyrate 



Oxy-butyr 



Time 



3675 



3675 



4320 



3675 



3675 





53-3 



40-5 



37-2 



19-9 



10-2 





5T8 



39-4 



40-1 



21-3 



11-3 





49-2 



40-2 



40-4 



20-4 



11-0 





50*3 



39-6 



40-7 



21-3 



lo-7 



10 6 K 



53-6 



39-7 



40*8 



22-0 



10-7 





55'5 



39-4 



40-7 



21-8 



10-7 





54-8 



40-0 



39-5 



21-9 



10-8 



Average 



52-6 



39-8 



39-9 



21'2 



10-8 



Average 



51-7 



40-0 



_ 



20-7 



10-6 



(duplicate) 











Hydrolysis at 35 



o 









Time 



2280 



2940 



1920 



3000 



5700 





107- 



92-7 



86-3 



50-9 



28-6 





ios- 



89-7 



86-5 



5T7 



27-8 





109- 



89-1 



88.5 



52-3 



28-5 



10 5 K 



no- 



93-3 



87-2 



51-7 



27-6 





112- 



91-4 



84-8 



51-4 



27-4 





111- 



94-1 



88-8 



51-3 



27-3 





(117-) 



92-3 



(82-3) 



51-2 



27-4 



Average 



no- 



91-8 



87-0 



51-5 



27-8 



Average 



109. 



90-9 





50-9 



27-4 



(duplicate) 











Hyd 



•olysis at 45 



o 









Time 



840 



840 



720 



1560 



1560 





248- 



205- 



203- 



113- 



61-7 





245' 



204' 



201' 



109- 



67'4 





243- 



209- 



203- 



115- 



64-2 



10 6 K 



240- 



206- 



198- 



114- 



64-1 





238' 



205- 



192- 



116- 



64-0 





234- 



201' 



186- 



115- 



63-5 





230- 



(192.) 



182' 



113- 



62-7 



Average 



239' 



205' 



195- 



113- 



639 



Average 



234- 



201- 



_ . 



111- 



64-1 



(duplicate) 











*This Journal, xxxiii, 27. 



