( 111 ) 



with diformin, however, cannot be distilled under those circum- 

 stances, but is decomposed with evolution of carbon monoxide and 

 dioxide and formation of allyl foi-mate. 



If triformin is heated slowly a decided evolution of gas is noticed 

 at 210° but in order to prolong this, the temperature must rise 

 gradually. The gas evolved consists of about equal volumes of carbon 

 monoxide and dioxide. The distillate contains as chief product allyl 

 formate, some formic acid, and further, small quantities of allyl 

 alcohol. In the flask a little glycerol is left '). 



Triformin is but slowly saponiiied in the cold by water in which 

 it is insoluble, but on warming saponification takes place rapidly. 



Ammonia acts with formation of glycerol and formamide. With 

 amines, substituted formamides are formed, which fact I communi- 

 cated previously ^). 



The properties described show that triformin, the simplest fat, 

 differs considerably in its properties from the triglycerol esters ot 

 the higher fatty acids. 



Chemistry. — "On some derivatives of l-^-^-hexattiene". By 

 Prof. P. VAN RoMBUKGii and Mr. W. van Dorssen. 



In the meeting of Dec. 30 1905 it was communicated that, by 

 heating the diformatc of s-divinylglycol we had succeeded, in pre- 

 paring a hydrocarbon of the composition CgHg to which we gave 

 the formula : 



CH, =: CH — CH rr: CH — CH — CH,. 

 Since then, this hydrocarbon has been prepared in a somewhat 

 larger quantity, and after repeated distillation over metallic sodium, 

 50 grams could be fractionated in a Ladenburg flask in an atmosphere 

 of carbon dioxide. 



The main portion now boiled between 77° — 78°. 5 (corr.; pressure 

 764.4 mm.). 



Sp. gr.i.3.5 0.749 

 n/),3.5 1.4884 



Again, a small quantity of a product with a higher sp. gr. and a 

 larger index of refraction (;ould be isolated. 



1) This decomposition of triformin has induced me to study the bchavioui" of 

 the formates of different glycols and polyhydric alcohols on heating, hivesligations 

 have been in progress for some time in my laboratory. 



2) Meeting 30 Sept. 1905. 



