TRANSACTIONS OF SECTION B. 587 



4. Compounds of Trinitrohenzene with Alkylated Arylamines. 

 By H. HiBBERT, M.Sc, and Professor J. J. Sudborough, Ph.D., D.Sc. 



In continuation of the earlier work ^ it has been found that trinitrohenzene 

 forms well-defined, stable additive compounds with the alkylated naphthylamines. 

 These compounds are all of a reddish or reddish-black colour, and are decomposed 

 when boiled with mineral acid. 



The products formed from trinitrohenzene and secondary bases — for example, 

 methyl a-naphthylamine and ethyl /3-naphthylamine — may be acetylated and yield 

 products which are identical with those obtained by the combination of trinitro- 

 henzene with the acetylated secondary base. As a rule these acetyl derivatives 

 are unstable, and when crystallised from different media decompose into their 

 constituents — namely, trinitrohenzene and the acetylated base. 



The compounds of trinitrohenzene with tertiary bases — for example, dimethyl 

 (j-naphthylamine and dimethyl /3-naphthylamine — are unacted on by acetic anhy- 

 dride, and may be boiled with this reagent for some time without undergoing 

 decomposition. 



The following compounds have been obtained : — 



1. Ethyl a-naphthylamine trinitrohenzene, dark maroon-coloured needles, 

 melting at 153-153°-5. 



2. Diethvl a-naphthylamine trinitrohenzene, scarlet needles, melting at 95- 

 95°-5. 



3. Dimethyl a-naphthylamiue trinitrohenzene, red needles, melting at 105-106°. 



4. Ethyl /3-naphthylamine trinitrohenzene, ruby-black prisms, melting at 106°; 

 the acetyl derivative crystallises in very large sulphur-yellow prisms, melting at 

 77-78°. _ 



5. Diethyl /3-naphthylamine trinitrohenzene, short black prisms, melting at 

 115-116°. 



5. Action of Alkalis on Cinnamic Acid Dihromide and its Esters. By 

 Professor J. J. Sudborough, Ph.D., D.Sc, and K. J. Thompson, 

 B.Sc. 



By the action of alkalis on cinnamic acid dihromide and its esters a mixture 

 of a-bromo-cinnamic and a-bromoa//o-cinnamic acid is obtained. "When the acid 

 dihromide itself is employed the main product is the a-«//o-acid and only a small 

 amount of the a-acid. When however the esters are used, the two acids are 

 formed in almost equal quantities. An increase in temperature, presence or 

 absence of sunlight, and the nature of the alkali employed affect but very slightly 

 the relative amounts of the two acids formed. Dimethyl aniline reacts with 

 cinnamic acid dihromide yielding as chief products cinnamic acid, a-bromo-cinna- 

 mene, and a minute quantity of a hrominated acid. 



6. On the Absorption of Ammonia from Water by Algce. 

 By Professor E. A. Letts, Ph.D., and Mr. J. S. Totton. 



7. On Determinations of Atmospheric Carbonic Anhydride made on Board 

 the ' Discovery ' on the Voyage to the Cape and thence to New Zealand. 

 By Professor E. H. Letts, Ph.D. 



8. A New Method of causing Isomerisation. 

 By Professor Raphael Meldola, F.R.S., V.P.C.S. 



' Journ. Chem. Soe„ 1901, 79, 523. 



