68 I.8.C. Proceedings of the Ninth [N.S., XVIII, 
Ipropionic acid, and cinnamic acid with methyl alcohol and also 
of. the’ A peeionding methyl eg with menthol. Hydrogen oo 
as catalyst in of 
was is fo 
qelculty constant is much iid than when ethyl esters are us red 
egal cosh Sood menthy] esters. The effect of the aB-olefine linking in 
and cinnamate is to reduce the values of K to about 
1 hoch 5 these for the corresponding saturated esters. 
An attempt to prepare ona sulphide dyes from aye ia 
other groups by replacing the auxochromes by m 
ae groups.— By E. e Watson and SIKHI Bug 
wn Dorr. 
engine oN aphthyl—L-mercaptan, C;H;N =N —C\)H,SH (L 
pre by Leuckart’s reaction on benzene-azo—L-naphthyl amine ; po 
PEs kr iisee tinting! oarbonol anhydride 
Se = ae 
cet SH 
C ~ 
4 
by Leuckart’s reaction on p-rosaniline. 
The former is coloured and soluble in sodium sulphide but gives 
very poor dyeings from a sulphide vat. The latter is colourless. This 
result was unexpected in view of the colour of thioindigo red. 
An attempt to prepare red sulphide dyes by introducing 
mercaptan groups into dyes of the azine, on 
i E 
Watson and Stxni Buusuan Dott 
Amido sulphydroxy phenazonium hydroxide 
N 
N 
OH CH 
has been prepared by diazotisin Safranine B (Apo-Safranine) and sub- 
jecting to Leuckart’s reaction ake s a sulphide dye but the shade is not 
interesting, being dull violet. 
Dimethy! we eee 
g 407 


