Abstract: An organic tri-substituted phosphine having a boiling point of at least 200.degree. C. and a reaction medium having a boiling point of at least 200.degree. C. are used in a hydroformylation of allyl alcohol with carbon monoxide and hydrogen in the presence of a rhodium complex catalyst. The concentration of the organic phosphine is 5.times.10.sup.-4 to 0.3 mol. per 1 liter of the reaction medium. The reaction medium is distilled at lower than 80.degree. C. under a reduced pressure and the bottom residue as the catalyst solution is recycled. The hydroformylation can be repeated by using the bottom residue as the catalyst solution.

Abstract: An alcohol is produced from a compound having an alkenyl group by a hydroformylation of said compound having an alkenyl group in a substantially water immiscible solvent in the presence of a hydroformylation catalyst which is soluble in said solvent and a hydrogenation of the reaction mixture in the presence of a hydrogenation catalyst.Water is added at a ratio of 0.5 to 30 times by weight base on an aldehyde produced by said hydroformylation before said hydrogenation, and an organic phase containing the hydroformylation catalyst component is separated from a water phase containing the alcohol produced by said hydrogenation and said organic phase is recycled into said hydroformylation.The compound having an alkenyl group is an aliphatic olefin, a hydroxyolefin, and olefin ether or an olefin ester and the corresponding saturated alcohol having one more carbon atom is produced.

Abstract: A method for imparting a hydrophobic property to a fine oxide powder by treating it with an organo-polysiloxane in the presence of an alkali catalyst. The method is carried out with at least 1.5% by weight of organo-polysiloxane of molecular weight not exceeding 10,000, at least 0.5% by weight of ammonia or an aliphatic amine of a boiling point lower than 100.degree. C. and at least 1.5% by weight of water are added to a dry weight of the fine oxide powder (a quantity obtained after removal of adsorption water content under reduced pressure not exceeding 5 mmHg in mercury meter at 100.degree. to 110.degree. C.). Of these additives, the ammonia or the aliphatic amine of a boiling point not exceeding 100.degree. C. is added at a temperature not exceeding 60.degree. C. Then, after an aging process for at least 15 minutes, heating is carried out to a temperature between 60.degree. and 150.degree.0 C. for a period of at least 30 minutes. All processes are carried out under normal pressure.