( N— -GgH^-CO— €(eil) ) 

 ; NH— €«H,— €H=€H ) 



i NH— € JI^— €H=€(OH) ^ 

 I XH—Cel-I,— €Hr=-t^(OH) \ 



Oxindol. 



■^1 ^ ^ ^ ' ^^ ^ L Dioxindol. 



( NH— ^eH^— €(eH)=€(OH) ) 



The method given above for the artificial formation of wA\i(^ 

 blue does not of course hold out any prospects of success in nril;.- 

 cing the natural by the artificial product, but is certainly ' 

 regarded as one of the highest triumphs of synthetic clienus 

 Berichte der Deutsohen Chem. GeseUschaft, 3^" JoJirgcmg,]- 

 (Nov. 28th, 1870). ■ V' 



2. On the products of the distillation of coal tar havi/r: 

 boiling points.— Ataong the products of the distillation < 

 tar having higher boiling points than anthracene, Grabe an i 

 bermann found chrysen "Cj gllj 3. Grabe has continued tlu 

 tigation, and has discovered a new hydrocarbon, having the 

 ula€jgHj„, to which he has given the name of Pyreii- 

 hydrocarbon may be isolated by combining it with pieri; 

 with which it forms a red crystalline mass, having the t. 

 ^t gII , o+^^eH.CNe^) 3OH. Ammonia unites with the :u ,■ 

 sets free the pyren in the foi-m of colorless leaves which j i ; 

 resemble anthracen, are soluble in al<u)hol, benzol, ether and W'- 

 phide of carbon. It melts at 142° V. and distills at a higher tei|^^ 

 perature than anthracen. Nit ric acid rcudilv converts PF^f" '' 

 nitro compounds. A mixture of potassic chromate and sulpnui 

 acid converts it into pyrene-chinon. Bromine o-ives two dern-- 

 tives, € 1 g H , I Jr^ .Bx^ and € ^ g H , Br 3 . Pyrene-chinon is ;> 

 " ' 1 is reduced by zinc powder to pyrene, ^vhich 

 s ph " 

 [fon 

 3*" Jahrg 



.3. On a new^ reaction for CJdoroform.—A. W. Ibf ^^J^'j, 

 given a very elegant process by which one part ot ehloiotor 

 5000-6000 parts of alcohol may be detected with certainty. 

 liquid to.be tested is poured into a mixture of aniline ^nth aii ai^^^ 

 hohc solution of caustic soda. When chloroform is P^^^''"-J„ ,,t 

 gentle heating a violent rear^tion takes place, with ^voi" ^^j 

 the characteristic powerful odor of the isonitril. I^'ff " ther 

 iodoform give the same reaction n^ w<'ll as chloral, l>nt it> 

 known substances.- Z?mV././e r/.r Ih.Urhen Chem. ^^^^^'^^ ./ ' 

 f " Jahrgang, p. 769. , ^'.^ 



4. On the ho,>,okHfues of Naphthalin. —rirric, aud 1^ ...^ 

 have succeeded in re,,lacin/ari atom of hydrogen m "^rj bv 

 by an atom of methyl or ethyl, by a process f^in^p^^^,,^^ „.tion of 

 which ethyl benzol was formed, that is to say, by the actio 



foi-mula.— i?ey*c/i.te der Deutschen 



