ex 



Journal of the Asiatic Society of Bengal. [N.S., XII, 



Effect of Ethylene Linkings on the Reactivity of Aldehydes and 



Ketones. — By J. J. Sudborough and T. Williams. 



Compounds of the Disulphonium Series II. Nitromercaptides 

 and their Interaction with the Alkyl Iodides and the 

 Replacement of Methyl and Ethyl Radicles by their Higher 

 Homologues. — By Prafulla Chandra Ray. 



Methyl nitromercaptide by interaction with methyl iodide yields the 



Tl/f ft 



expected compound *~ g .Hglg.Mel ; if, however, the higher homo- 

 logues of methyl iodide, e.g., ethyl—, propyl—, butyl—, and amyl- 

 iodides be used in the reaction it is found that instead of the anticipated 



compounds, we get ^j HgI,EtI ; "jjj .Hgla.PrI ; g^~| .HgL 2 .BuT 



and ^ a .Hgls.AmI respectively ; in other words an intermolecular 



Am — o ° 



replacement of the light radicle methyl by its higher homologues takes 

 place. Similar replacement also occurs in the case of ethyl nitromercap- 

 tide. 



Bromination of Hydrocarbons and the Formation of Bromo- 

 picrin and Tetrabromoquinone by the Action of Bromine 

 and Nitric Acid on Organic Bodies. —By R. L. Datta and 

 N. R. Chatter jee. 



In continuation of the researches on the action of aqua regia on 

 organic bodies, it has been found that on mixing nitric acid and hydro- 

 bromic acid, NOBrg separates in quantitative yield affording a rapid 

 method for the preparation of this body. Bromine in conjunction with 

 nitric acid has been found to be a very powerful and economical method 

 of brominating the lower aromatic hydrocarbons. Benzene, Toluene, 

 Ortho-xylene, Meta-xylene Para-xylene, Mesitylene, ethyl-benzene have 

 been brominated with the formation of both the higher and lower bromo- 



derivatives. 



A mixture of bromine and nitric acid has a destructive action on 



most organic bodies, resulting in the general formation of bromopicrin. 

 In the case of aromatic substances which possess or pass through a quini- 

 noid structure, tetra-bromoquinone is invariably produced and as tetra- 

 bromoquinone also breaks up finally to bromopicrin, the formation of 

 the latter also takes place in these cases. These have been found to be 

 so from a study of a large number of cases. 



Direct Iodination of Hydrocarbons by means of Iodine and 

 Nitric Acid. — By R. L. Datta and N. R. Chatterjee. 



It has been found that in the presence of nitric acid, iodine directly 

 enters into aromatic hydrocarbons with the formation of iodo-derivatives. 

 Very good yields of iodo-derivatives ranging from 80% to 50% can be 

 realized by this method. Benzene, Toluene, Ortho-xylene, Para-xylene, 

 Meta-xylene, Mesitylene, Thiophene, Cy mene have been found to give 

 the monoiododerivatives readily. Napthalene gives a mixture of iodo — 

 and nitronapthalene. Anthracene is oxidised to anthroquinone and no 

 iodination takes place. 



The direct iodination of some of the aliphatic hydrocarbons has been 

 found to be possible though the yield is very small, due to the chance of 

 hydrolysis of iododerivatives in the presence of nitric acid. Pentane and 

 hexane give small quantities of the monoiododerivatives. 



