( -±53 ) 



Diben:ahu//ose, m.p. 130°, [«]/) = -f 37°.5 (in M. tilc). 



Diheiizah'hamiiose, iii.p. 128'', [«]/> =: -}- ö^"" ,, ,, ,, 



Of the oily dibenzalhexoses, those dei'i\'ed from mannose, glucose 

 and galactose show a faint right-handed polarisation, but the products 

 obtained from fructose and sorbose are somewhat laevo-rotnlory. 

 It has already been noticed that they still retain a hydroxylgroup ; 

 these acetylderivatives also have not as yet been obtained in a 

 crystalline state. 



The (jhicoskles react much more readil}^ Avith benzaldehyde than 

 the sugars. On dissolving the substances in benzaldehyde and boiling 

 for some hours with addition of a little aidiydrous sodiumsulphate, 

 benzalderiA'atives are formed which are all readily crystallisable 

 substances. 



Monohenzal a- metJtylglucoside, m.p. 158°, [«]ö = + 85''. 



„ „ /?. ,1 ^ „ „ 194°, [a-]D = — 75°. 



,, ,, methyhnannoside, „ llO'', faint laevo-rotatory 



Di „ „ „ „ 178°, [a]D = — 5°. 



The last two are formed simultaneously and may be separated 

 bj' means of hot water. 



It must also be observed that other aromatic aldehjxles, such as 

 p-totuylaldehyde and cuminol, also enter into combination with sugars; 

 salicylaldehyde cannot react Avith sugars because it is two readily 

 converted by P2O5 into disalicylaldehyde, but its derivatives with 

 glucosides have however already been obtained. 



Further particulars of this research will be published more fully 

 later on in the Recueil. 



Lab. of the Fin. Dep. Nov. 1903. 



Chemistry. — Professor Lobky de Bhuyn presents a communicalion 

 from Mr. 0. H. vSluiter on: ^'The transformation of isonitro- 

 soacetoplienonsodiurn into .sodium henzoate and hydroyen cyanide" . 



(Communicated in the meeting of Dec. 19, 1903). 



When Claisen had discovered his well-known condensation process 

 and had demonstrated for ketones that the hydrogen of the methyl 

 grouj) adjacent to the carbonyl group is readily replaceable, he also 

 found that the isonitrosoketones could be obtained with the aid of 

 auiylnitrite and sodium alcoholate '). With Manasse ^) he investigated 



1) Ber. 20. 656. 



2) Ber. 20. 2194. 



30* 



