Manganous oxide

By passing the vapour of a monobasic acid through a tube containing manganous oxide deposited on pumice and heated to 300-350°, the metallic ... 

The complete assembly for carrying out the catalytic decomposition of acids into ketones is shown in Fig. Ill, 72, 1. The main part of the apparatus consists of a device for dropping the acid at constant rate into a combustion tube containing the catalyst (manganous oxide deposited upon pumice) and heated electrically to about 350° the reaction products are condensed by a double surface condenser and coUected in a flask (which may be cooled in ice, if necessary) a glass bubbler at the end of the apparatus indicates the rate of decomposition (evolution of carbon dioxide). The furnace may be a commercial cylindrical furnace, about 70 cm. in length, but it is excellent practice, and certainly very much cheaper, to construct it from simple materials. 

Use the apparatus described in Section 111,72 and adjust the furnace for a working temperature of 400-450°. Although a manganous oxide catalyst gives satisfactory results, thoria is more convenient in practice. 

This is a way to do this procedure without having to use one of those crazy tube furnaces stuffed with thorium oxide or manganous oxide catalyst [21]. The key here is to use an excess of acetic anhydride. Using even more than the amount specified will insure that the reaction proceeds in the right direction and the bad side reaction formation of dibenzylketone will be minimalized (don t ask). 18g piperonylic acid or 13.6g phenylacetic acid, 50mL acetic anhydride and 50mU pyridine are refluxed for 6 hours and the solvent removed by vacuum distillation. The remaining residue is taken up in benzene or ether, washed with 10% NaOH solution (discard the water layer), and vacuum distilled to get 8g P2P (56%). 

Manganoxyd, n. manganese oxide, specif, manganic oxide, manganese (III) oxide. — rotes mangano-manganic oxide, manganese-(II,III) oxide. 

Manganoxydul, n. manganous oxide, manganese (II) oxide. — schwefelsaures —, man-ganoiis sulfate, manganese (II) sulfate. 

Manganese Hydrate. . Manganic Oxide. . Manganoua Oxide. . . ... 

Octanal has been prepared by the reduction of caprylonitrile with hydrogen chloride and stannous chloride,2 by the passage of a mixture of caprylic acid and formic acid over titanium dioxide3 or manganous oxide,4 by dehydrogenation of 1-octanol over copper,6 and by oxidation of 1-octanol.6... 

A somewhat similar process to the Lahousse has been protected by French patent 447688, 1912, in the names of T eissier and Chaillaux. In this process barium sulphate is heated with manganous oxide, when the following reaction takes place.—... 

When the reaction is complete, steam under pressure is passed over the mixture of barium sulphide and manganous oxide, with the production of hydrogen, in accordance with the following equation —... 

Neither catalyst showed any evidence of crystalline components by X-ray diffraction. The permanganate on silica gel apparently remains as permanganate. The permanganate on activated carbon appears from the spectrum to have been reduced to Mn02 or to some other hydrous manganic oxide. 

Foster, P.K. Welch, A.J.F. (1956) Metal-oxide solid solutions. Part 1. Lattice constant and phase relationships in ferrous oxide (wiistite) and in solid solutions of ferrous oxide and manganous oxide. Trans. Faraday Soc. 52 1626-1635... 

Synonyms manganous oxide manganese monoxide green manganese oxide manganosite [1313-12-8]... 

By heating a mixture of sulphuric acid, sodie chloride, and manganic oxide, when the whole of the chlorine present is liberated... 

If in the second process a mixture of manganic oxide, hydrochloric acid, and sulphuric acid be employed, the whole of the chlorine is evolved... 

By mixing the potassic chlorate with manganic oxide, the oxygen is evolved at a much lower temperature the man> gouic oxide appears to take no part in the reaction. 

PreparaUm.—Powdered mangauio oxide is suspended in water and a current of sulphurous anh rdride passed through the liquid, when the manganic oxide gradoaUj dissolves. The solution ooutaius manganous dithionate or hyposulphate — JOaO, + 2SO, S, 0,Mno". 

Bjr heating a mixture of about three parts hy weight of sulphur (two atoms) with four of manganic oxide (one atom) i—... 

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