UNITED STATES PATENT OFFICE.

LEONHARD LEDERER, OF MUNICH, GERMANY. PROCESS OF PRE PARNG HAO D DERVATIVES OF ACET ONE.

SPECIFICATION forming part of Letters Patent No. 643,144, dated February 13, 1900. Application filed August 10, 1897, Serial No. 647,759. (No specimens.) To all livhon, it nay conce77: iodacetone. Also if not kept dry it some Beit known that I, LEONHARDLEDERER, a times undergoes decomposition at an ordi citizen of the Kingdom of Bavaria, residing nary temperature, thereby evolving so much SO at Munich, Bavaria, Germany, have invented heat that vapor of iodin is set free. Alco a new and useful Process of Preparing the hol, ether, and most of the organic solvents IIalogen Derivatives of Acetone, of which the set free iodin from per-iod-acetone. With following is a specification. dilute soda-lye it forms iodoform in the cold. 55 It is well known that the halogens act read The action of iodin on acetone-dicarbonic. ily upon acetonedicarbonic acid. For in acid can be so regulated by definite diminu stance, bromin added to an aqueous solution tions of the quantity of iodin added as to re of acetonedicarbonic acid is immediately sult in lower stages of iodin combination with taken up. An aqueous solution of acetonedi acetone. With regard to its behavior toward carbonic acid decomposed with an alcoholic alcohol and ether the penta-iod derivative is iodin solution takes up quickly the color of in close relation with the periodacetone. On the latter without visible reaction. If, how the addition of dilute soda-lye it is trans ever, this mixture be gently Warmed, reac formed into iodoform even in the cold, but tion takes place, evolving carbonic acid gas; not with the soda solution. If one Warms it but the action of the iodid of hydrogen pres with the latter, it is converted, as in the case ent in the said iodin solution makes it diffi of tetra-iod-acetone, into di-iod-acetone. Bro cult to obtain the products of such reaction. min and chlorin act in a similar way with To obviate this difficulty, I add to the mass a regard to acetone dicarbonic acid. In conse substance which has an affinity for the iodid quence of the liability of setting free halo of hydrogen, thus removing its disturbing in gem hydrogen acids it is not necessary to o fluence. Iodic acid serves excellently for take any special precautions in observing the 25 this purpose. In this way it is possible to progress of the reaction. In some cases it is use the iodin to the utmost extent. advisable to add carbonate of calcium or In carrying out my process I dissolve ten similar substances to combine with the free 75 parts of acetone dicarbonic acid in ten times acids or to use simply dilute solutions of the its mass of Water and gradually add thereto acetone dicarbonic acid. twenty parts of iodin while the mixture is The following is the equation for the use constantly stirred. The reaction takes place of ten molecules of bromin in this process: promptly with a lively evolution of carbonic acid gas. It is advisable to cool gently CH thereafter, because at a high temperature the 35 periodacetone is easily decomposed by pre CH,">Co. cipitation of iodin. The addition of iodic Having thus fully described my invention, acid must begin when the light-yellow mass what I claim as new, and desire to secure by 85 takes on an orange color in reaction. As Letters Patent, is soon as the iodin is all used up the reaction A process of preparing a halogen derival is ended. The resulting periodacetone is tive of acetone by causing a halogen to react then at once separated from this liquid. with acetone dicarbonic acid in the presence Thoroughly washed and dried at ordinary of a substance adapted to act on the corre temperature, it forms a light-yellow crystal sponding halogen hydrogen acid, Substan line powder, which becomes dark on heating tially as set forth. 45 up to 60 centigrade. If it has previously - LEONHARD LEDERER. been freed from water, it melts at 78 centi Witnesses: grade. On boiling with Water it sets free io CARL SINGER, din and becomes penta- and eventually tetra, PAUL MUNZ.