Mr Crocker , On the formation of Di-nitro-phenoxazines. 343 
Amido-phenol-sulphonic acid (NH 2 : 0H = 1 : 2). 
The amido-phenol-sulphonic acid was dissolved in dilute 
alcoholic soda and added to the hot alcoholic solution of picric 
chloride, stirring meanwhile. The liquid became almost solid 
from the deposition of minute bronze plates. This was filtered 
after cooling, and washed with dilute alcohol, then recrystallised 
from hot water, in which it is only moderately soluble. 7*6 gm. of 
the amido-phenol-sulphonic acid gave 1T3 of the product: about 
70% yield. After drying at 150° for some time, the substance 
was obtained as a rouge-coloured powder and the percentage of 
sodium agreed with that required for di-nitro-phenoxazine-sodium- 
sulphonate. 
I. -4120 gm. gave -0760 Na 2 S0 4 
II. *4157 „ *0763 „ 
I. II. Calc. 
Na 5-97 5-95 6-13 
Its aqueous solution was dark -red and gave the characteristic 
violet-blue of the oxazines with hot potash solution. It is almost 
insoluble in alcohol and acetic acid. 
Amido-ft-naphthol (NH 2 : OH = l : 2). 
To 195 gm. of the hydrochloride of amido-/3-naphthol, dis- 
solved in dilute alcohol, was added a hot solution of 1*2 gm. NaOH 
in dilute alcohol, then the mixture was stirred into a hot solution 
of 2’5 gm. picric chloride in dilute alcohol. On cooling and filtering 
a red-brown powder was left, which when recrystallised from 
aniline formed silky hair-like light-brown needles. The aniline 
was washed out with alcohol and the crystals were dried at 180°. 
Analysis agreed with the expected body, naphtho-di-nitro- 
phenoxazine. 
I. ’2285 gm. gave 25*2 c.c. N at 15° and 771 bar. pr. 
•1734 „ 
20*6 c.c. 
„ 25°-2 and 752 bar. 
•1989 
•4305 C0 2 
, and -0550 H 2 0 
I. 
II. 
III. 
Calc. 
N 
13*11 
13-30 
— 
13-01 
0 
— 
— 
59-02 
59-44 
H 
— 
— 
3-07 
2-79 
The molecular weight of this body was determined. 
The solution of T208 gm. substance in 20 gm. naphthalene 
lowered the freezing-point of the solvent T35°C. 
Experiment Theory 
Molecular weight 313 323 
