Hi bs he | REPORT OF SCHIMMEL 8 Co. “Ap/OcrOBER 
Prussian-blue test. In both cases a glucoside may heave been present i which Re 
prussic acid. 
In strawberry leaves, an intense smell of lemons spielen ‘which indicated | f | 
presence of citral. So ie 
Since a large amount of oil-drops was Goticed’ i the original distillate of various 
plants—the ivy amongst others—Franzen and Wagner assume that ay Mate an. ry 
essential oil, about which nothing further is yet known. i 
Aldehydes. ‘a Rane 
Ch. Moureu and G. Mignonac*) give a process for the preparation of aldehydes i 
and ketones from primary and secondary alcohols by catalytic oxidation. By means — 
of silver nitrate and formaldehyde, silver was precipitated in a finely divided condition 
on asbestos, which was used as the catalyst. It was shown to be advantageous to — 
first pass the alcohol vapour with an insufficient quantity of air over the catalyst re 
heated to 230 to 300°. The reaction mixture was then exposed with the remainder of 
the calculated quantity of air to a second layer of the catalyst. There were produced: — 
From methyl alcohol at 360 to 400°, 62 per cent. formaldehyde, obtained from trans- 
formed alcohol, together with CO, CO. and hydrogen; from ethyl alcohol at 340 to 380° 
89 per cent. acetaldehyde, CO, and CO; from n-butyl alcohol at 330 to 350°, 93 per cent. : 
butanal; from amyl alcohol at 330 to 350°, 94 per cent. valeraldehyde; from allyl 
alcohol 70 to 75 per cent. acrolein; from benzyl alcohol at 300°, 80 per cent. benz- 
aldehyde; from cinnamic alcohol at 300°, 60 to 70 per cent. cinnamic aldehyde; from — 
isopropyl alcohol 90 per cent. acetone; from secondary butyl alcohol at 350 to 400° vd 
90 to 96 per cent. etic ketone. 5 oa 
We have already pepatied on a new universally applicable method of Rosenmund 2), ; 4 
according to which, -aldehydes can be prepared by the catalytic reduction of acid ~~ 
chlorides. According to A. Sonn and E. Miiller®), the following process— starting from =~ 
the imidochlorides—for preparing aldehydes is applicable to aromatic acids, and in : 
many cases is to be preferred to the Rosenmund method. Since the chlorine in the - q 
imidochlorides is very easily exchanged for hydrogen by means of stannous chloride 
in ethereal solution, the tin double-salts of the Schiff bases can be easily obtained, © 
and on heating these with dilute acids, the aldehyde may be produced. ke 
Thus to obtain benzaldehyde, 70 g. (4 molecules) of dried stannous chloride are 4 
dissolved in 350 cc. of water-free ether by passing in hydrochloric acid gas. 25 g. a 
(1 molecule) of freshly prepared benzanilide-imidochloride CsH;-C-Cl: N-CgH; in 200 CO a 
of dry ether are added to the above solution, when the crystalline, lemon-yellow tin ~ 
double salt is gradually precipitated (CsH;CH: NC,Hs)(HC1,SnCl.). Treated with hydro- | a 
chloric acid and steam-distilled, the salt is easily decomposed, and the yield of Gene 
aldehyde is nearly quantitative. ig 
Sonn and Miller similarly prepared the Petal of cinnamic acid, prhydrox - 
not sufficiently pure. 
1) Compt. rend. 170 (1920), 258. As per Chem. Zentralbl. 1920, L Sap: —. *) Report 1918, 122. ine 3) 
Berichte 52 (1919), 1927. ; Rees 1) 
