Phenyliodide Chloride and Iodosobenzene Acetate. 553 
A combustion of the solid was made mixing it in the boat with 
freshly ignited K 2 Cr,0 7 . 
•1175 gave ’0854 C0 2 and '0035 H,0. C = 20 00°/ . 
H,0 = 2-31%. 
Now 
C (COOK)., 
II 
C (COOK), 
C (COOK) 2 
C (COOK), 
requires K = 43 82 %. H = 0 % and C = 20’22 %. 
HoO requires K = 4T7l / . 
H = 4 - 81 °/ Q and 0 = 19-25%. 
And 
C (COOK), 
C(COOK) 2 
2H„0 requires K = 39‘79 %. 
H = 9 18 % and C = 18-3G %. 
Also caustic potash saponifies the ethyl ester of ethane tetra- 
carboxylic acid to ethane tricarboxylic acid, and this again breaks 
up on continued saponification with potash, therefore the solid 
obtained cannot be the potassium salt of ethane tetracarboxylic 
acid. Again, K 4 C u 0 8 . H,0 requires 4\81 °/ Q of water, and on com- 
bustion of the solid only 2%31 % was obtained, which can therefore 
be put down to experimental error and residual moisture in the 
combustion tube. The solid must therefore be the tetrapotassium 
salt of ethylene tetracarboxylic acid. This result is in accordance 
with theory. 
The action of disodium-malonic ester on phenyliodide chloride 
is therefore to form ethane tetracarboxylic ester in small quantities 
as a bye-product, and mainly ethylene or dicarbon-tetracarboxylic 
ester. The free acid is very unstable and an attempt to prepare it 
proved unsuccessful. 
The potassium salt was obtained as a very hygroscopic white 
powder. 
Action of iodoso-henzene acetate on monosodium malonic ester. 
The iodoso-benzene acetate used was prepared by dissolving 
iodoso-benzene in a small quantity of glacial acetic acid, evaporating 
the solution to dryness on the water-bath and after pulverising 
the solid residue, re-crystallising from benzene. Colourless prisms of 
/OOC. ch 3 
c 6 h 6 -i( 
x ooc. ch 3 
melting at 157 were thus obtained. 
