174 
DB. E, EEANKLAI^D ON A NEW SEEIES OF 
compound may be conveniently termed diethylate of boric dioxyethide. The formula 
of the latter ■will therefore be 
2 ’ 
JC 4 H 5 
or B< C4 Hg O 2 
The formation of diethylate of boric dioxyethide from boric ethide may be thus 
represented : — 
C4Hg 
B^C^Hg + 04 = B<;C4Hg02 
!C4Hg 
C4 Hg O2. 
This view of the constitution and mode of formation of the oxidized product is sup- 
ported by its beha'viour with water ; for when diethylate of boric dioxyethide is placed 
in contact with water it is instantly decomposed, alcohol and dihydrate of boric dioxy- 
ethide being formed, according to the following equation : — 
C4 H5 
H 
B^C4Hg02 + 2j^[02=.B^H0 
C4H5O2 
C4Hg 
HOo 
O., 
Diethylate of boric 
dioxyethide. 
Dihydrate of boric 
dioxyethide. 
Dihydi’ate of boric dioxyethide may be conveniently prepared in a state of purity by 
agitating its aqueous solution with ether, which dissolves the boric compound. The 
ethereal solution must then be decanted, and on evaporation at common temperatures 
in a stream of dry carbonic acid, the new compound is left behind as a white and very 
volatile crystalline mass. The latter was sublimed at a gentle heat in a current of dry 
carbonic acid, and was made to condense in weighed tubes for analysis. 
I. "3870 grm., burnt with oxide of copper in a stream of air, gave *4652 grm. carbonic 
acid and '3285 grm. water. 
II. *5087 grm., oxidized with nitric acid in a sealed tube, the liquid supersaturated with 
a known weight of magnesia and then evaporated to dryness, gave *2387 grm. boracic 
acid. 
These numbers agree closely with the formula of dihydrate of boric dioxyethide : — 
Calculated. 

Found. 
C 4 . 
. . 24 
32-47 
I. 
32-78 
II. 
H; . 
. . 7 
9-47 
9-43 
B . 
. . 10-9 
14-75 
14-66 
O 4 . 
. . 32 
43-31 
— 
— 
73-9 100-00 
Dihydrate of boric dioxyethide is a colourless, volatile, crystalline body, very soluble 
