A study of the preparation of nickel catalysts1 indicated that in general sodium bicarbonate was to be preferred to sodium carbonate or potassium hydroxide as a precipitant in the preparation of nickel catalysts. This was true because the resulting catalysts were somewhat more active and less sensitive to variations in the procedure of preparation. More recently it has become evident that ammonium carbonate is in general the most satisfactory precipitant.Procedure Recommended for the Preparation of a Nickel Catalyst.-Fifty-eight grams of Baker and Adamson or Mallinckrodt c. p. nickel nitrate hexahydrate (Ni(N03)2-6H20), dissolved in 80 ml. of distilled water, was ground for thirty to sixty minutes in a mortar with 50 g. of acid washed kieselguhr (ex Johns-Manville "Filter-Cel") until the mixture was ap-726 mm.).h This fraction was taken 76 to 80°( 11 mm.). The diethyl acetal of tetrahydrofurfural was reported by Scheibler, Sotscheck and Friese [Ber., 57, 1443 (1924)] to have a boiling range of 187-190°. Bolander and Minne in this Laboratory have found the boiling point of the pure compound to be 194.5°. hydrogenation of a variety of organic compounds as summarized in the paragraphs in "Other Hydrogenations'' and in Table IV.

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p ‐Nitrobenzaldehyde reactant: 50 g. (0.36 mole) of p ‐nitrotoluene intermediate: p ‐nitrobenzaldiacetate product: p ‐nitrobenzoic acid product: p ‐bromobenzaldehyde intermediate: p ‐bromobenzaldiacetate product: p ‐nitrobenzaldehyde

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