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In two previous papers3 the platinum oxide obtained by the fusion of chloroplatinic acid and sodium nitrate has been shown to be an excellent catalyst in the reduction of organic compounds. This method for the preparation of an oxide of platinum is new. The chemical nature of this oxide and a quantitative study of the best conditions for its preparation have not yet been described. This communication -discusses (1) the best fusion temperature for preparing the platinum oxide of highest catalytic activity;(2) the quantitative analysis of various samples of the catalyst prepared at different temperatures;(3) the general chemical properties of the oxide; (4) a comparison of the activity as a catalyst of the oxide of platinum prepared from chloroplatinic acid by fusion with sodium nitrate and by fusion with the nitrates of other metals; (5) a comparison of the catalytic activity of the oxide made by the sodium nitrate fusion method with the oxides of platinum prepared by methods which have already been described in the literature.

2. The compound was readily resolved through the strychnine salt. 3. The active forms did not racemize under the ordinary conditions which might be expected to effect racemization. Urbana, Illinois

The reaction which takes place between a carbonyl compound such as an aldehyde, ketone, or an ester, and an alpha‐haloester in the presence of zinc is commonly known as the Reformatsky reaction. It represents an extension of the reactions of carbonyl compounds with a dialkylzinc or an alkylzinc halide, but possesses the advantage that the isolation of the organozinc compound is unnecessary. The process creates a new carbon‐carbon linkage and involves the following: Formation of an organozinc halide; addition to the carbonyl group of the aldehyde or ketone, decomposition by dilute acids.

The formation of a hydrocarbon analyzing for ( ß by the action of boron fluoride, boron oxide, sulfuric acid, phosphorus pentoxide, or zinc chloride on benzyl alcohol or benzyl ether was first reported by Cannizzaro (1) in 1854. Compounds of apparently related structure were isolated by Nef (2) from the treatment of benzyl alcohol or various benzyl ethers or esters with sulfuric acid, phosphorus pentoxide, or aluminum chloride. Auger (3) found that sulfuric acid or aluminum chloride converted benzyl alcohol into a hydrocarbon, (CiHe),,, having a molecular weight corresponding to 16 to 18 units. By passing benzyl alcohol vapors at 300-360°over various dehydrating oxides, such as those of aluminum, titanium, and chromium, Sabatier and Mailhe (4), and later Mailhe and de Godon (5) using calcined alum at a lower temperature, prepared a yellow insoluble amorphous product also analyzing for (CiHg),,, which was apparently the same as a resinous substance previously reported (6, 7). From the treat-

The reaction of a methyl Grignard reagent with substances of the type of 10-acetoxyanthrone-9 results in the replacement of the acetoxy group by an alkyl radical, as well as addition to the carbonyl group, with the eventual production of (27) Gomberg, Ber., 39, 2963Ber., 39, (1906. 9,10-dimethylanthracene. This apparently novel replacement reaction of acyloxyanthrones seems to be attributable to the special reactivity of the acyloxy group, and an analogy has been found in the smooth reaction of triphenylmethyl acetate with methylmagnesium bromide to give , ,triphenylethane.

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