Verfahren zur Herstellung von Propylenharnstoffderivaten

摘要

1,188,553. Propyleneureas and process for their production. BADISCHE ANILIN- & SODA-FABRIK A.G. 16 Aug., 1967 [17 Aug., 1966; 18 Aug., 1966], No. 37681/67. Heading C2C. Propyleneureas or propylenethioureas of the formula wherein R1, R2 and R5 are hydrogen atoms or C 1 _ 4 alkyl groups, R3 and R4 are C 1 _ 4 alkyl groups and X is oxygen or sulphur, are obtained by reacting a urea or thiourea of the formula wherein R6 is hydrogen or a C 1-4 alkyl group, with a urea or thiourea of the formula in a molar ratio of about 1:1 at a temperature of 30-100‹ C. in the presence of a non-oxidizing acid, the reaction being carried out in the presence of a C 1-4 alkanol when R5 in the above Formula I is a C 1-4 alkyl group. The reaction is preferably effected in the presence of a solvent or diluent, e.g. an ether such as dioxan or tetrahydrofuran, or a C 1-4 alkanol, or a mixture thereof. The ureas or thioureas of Formula II may be used in the form of mixtures obtained by reaction of a urea or thiourea of the formula with formaldehyde in a molar ratio of about 1: 2, optionally in the presence of an alkanol of the formula R6OH. The ureas or thioureas of Formula III may be used in the form of reaction products obtained by reaction of ureas or thioureas of the above Formula (IV) with aldehydes of the formula in a molar ratio of about 1: 2, optionally in the presence of an alkanol of the formula R6OH. 1,188,557. Diacetone 2-ketogulonic acid by electrolysis. F. HOFFMANN-LA ROCHE & CO. A.G. 22 Aug., 1967 [24 Aug., 1966], No. 38680/67. Heading C2C. [Also in Division C7] Diacetone 2-keto-gulonic acid is produced by passing a current through an aqueous alkaline solution of pH greater than 9 containing diacetone sorbose using a nickel oxide anode in which the nickel has an average valency of from 2À7 to 4. The cathode may be of stainless steel, " Monel " (Registered Trade Mark), Pt or Pd and the nickel oxide is preferably supported on a conductive material such as stainless steel, " Monel," sintered Ni, Ni plated iron, graphite or carbon. The nickel oxide coating may be formed before carrying out the process by impregnating a porous sintered Ni body with a nickel salt and then subjecting the body to anodic treatment or the support material may be connected as anode in a first stage of the process in the presence of nickel hydroxide and/or oxide or a nickel salt such as nitrate, sulphate acetate or formate, although the nickel compound may be omitted if the support is of sintered Ni. The organic acid is produced in a bath at 25‹ to 85‹ C. which is agitated mechanically or by pumped circulation.