( 541 ) 



the three-phase line for solid iodine is interseeted botii on liraneh 

 lb and In and therefore tlie complication in the tignre occurs at 

 the side of the iodine. 



Still greater complications may appear when according to Fig. 3 

 (previous communication) there exist liquids witii a miiumnm pressure 

 and wiien consequently the branches lb, In and lb can also appear 

 at the side of the liquids richer in B, whose intersection at an equal 

 pressure may coincide eventually with those of branch 2 or branch 

 3. When such systems have been more closely investigated it will 

 not prove difficult to give detailed t, .I'-figures for the same. 



Chemistry. — "T/te reduction of ncraldeliyde nnd some derivatives 

 of s. divinijl (jhjcol (3.4 dihydroxy 1.5 liexadieney . By Prof. 



P. VAN ROMBIKGH and W. VAN DORSSEN. 



(Communicated in tlie Meeting of November 25, 190.5) 



The reduction of acraldehyde (acroleine) with sodium amalgam ') 

 as well as with zinc and hydrochloric acitl ") has been studied by 

 Linnb;mann, who states that he has obtained in the first case propyl 

 and wopropyl alcoliol, in the second case wopropyl and allyl alcohol, 

 also a substance called acropinacone of the composition CjH,/)^, or 

 rather a product of non-constant boiling point, of which the fractions 

 boiling between 160'' — 170' and J 70° — 180"' gave, on analysis, values 

 which led to this formula. 



Claus ') could not confirm the results of Linxemann as regards the 

 formation of «cpropyl alcohol in the reduction with zinc and hydro- 

 chloric acid. 



Griner *) has also repeated Linnemann's experiments with the object 

 of pre[)aring acropiiiacone (divinylglycol) but only obtained very small 

 quantities of a li(|ui(l wilhoiit constant boiling point \\liich bore no 

 resemi)lance lo the glycol which, however^ was obtained by him 

 in fairly large quantity by reduction of acraldehyde in acetic acid 

 solution with a copper-zinc couple. The other products of the reaction 

 have not been further described by the author. 



If we consider the formula of acraldehyde in connection with the 



1) Ann. d. Chem. u. Pliarm. 125 (1S(J3) S. 31.5. 



5) Ibid Suppl. Ill (1864-1865) S. 257. 



3) B. B. III. (1870) S. 404. 



*) Ann. d. Phys, et Chim. [6J 26 (18'J2). p. 363. 



