(271 ) 
We shall try to determine whether pure tagatose readily yields 
l-sorbinose under the influence of alkalis. 
We have also again taken up the investigation of the probable 
formation of a new ketose (called, for the present, y-fructose 1) by 
the reciprocal transformation of glucose, fructose and mannose under 
the influence of alkalis. 
The following triplets of hexoses (two aldoses and a ketose) are 
now known which give the same osazone: 
d- and /-glucose, — fructose and — mannose 
d- and /-gulose, — sorbinose and — idose 
d-galactose, — tagatose and — talose. °) 
A complete account of this investigation will be published in 
the “Recueil’’. 
Chemistry. — “On the action of sodiummono- and -disulphides 
on aromatic nitro-compounds.”’ By Mr. J. J. BLANKSMA. 
(Preliminary communication). Communicated by Prof. C. A. 
Losry pre Bruyn. | 
It has been shown for orthodinitrobenzene by LAUBENHEIMER ®) and 
for paradinitrobenzene by Losry DE BRUYN *) that the nitrogroup 
can be readily replaced by other groups. The investigation of the 
behaviour of the alkalisulphides, although promised 5), has not been 
taken up until the present. Some positive result may be expected 
from this study since NretzkKr and Bornor®) have proved that 
the corresponding dinitrodiphenylsulphides are formed from o- and 
p-chlornitrobenzene and sodiummonosulphide. 
It has now been found that orthodinitrobenzene reacts not only 
with sodium monosulphide but also with the disulphide in a similar 
1) Recueil, 16, 278. 
2) The d-tagatose has yielded d-talite along with dulcite. 
3) Ber. 9, 1828; 11, 1155. 
4) Recueil 18, 121. 
5) Recueil 18, 105—106. 
6) Ber. 27, 3261; 29, 2774. 
