Rosenmund还原
酰氯在BaSO4，喹啉-S或硫脲钝化的Pd催化剂的催化下氢化还原得到醛的反应。如果不进行钝化，生成的醛会继续还原成醇，因此可能的副产物有醇，酯和烷烃等。反应常用的溶剂有甲苯、二甲苯等等。
反应机理
反应实例
参考文献
1. Rosenmund, K. W. Ber. 1918, 51, 585–594. Karl Wilhelm Rosenmund was born in Berlin, Germany in 1884. He was a student of Otto Diels and received his Ph.D. In 1906. Rosenmund became professor and director of the Pharmaceutical Institute in Kiel in 1925.【Karl Wilhelm Rosenmund1884年生于德国柏林。Otto Diels的学生，1906年获得Ph.D.学位。1925年出任在基尔的药物研究所的主任。】
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编译自：Name Reactions （A Collection of Detailed Reaction Mechanisms）, Jie Jack Li, Rosenmund reduction，page 525-526.
Rosenmund法合成醛反应（ Organic Syntheses, Coll. Vol. 6, p.1007; Vol. 51, p.8）
A pressure vessel is charged in order with 600 mL of dry toluene,25 g. (0.30 mole) of anhydrous sodium acetate,3 g. of dry, 10% palladium-on-carboncatalyst,23 g. (0.10 mole) of 3,4,5-trimethoxybenzoyl chloride, and 1 mL of Quinoline S. The pressure vessel is flushed with nitrogen, sealed, evacuated briefly, and pressured to 50 p.s.i. with hydrogen. The mixture is shaken with 50 p.s.i. of hydrogen for 1 hour at room temperature, then heated at 35–40° for 2 hours. Agitation is continued overnight while the reaction mixture cools to room temperature. The pressure on the vessel is released, the vessel is opened, and the mixture is filtered through10 gof Celite filter aid, and the insoluble material is washed with 25 mL of toluene. The combined filtrates are washed successively with 25 mL of 5% sodium carbonate solution and 25 mL of water. The toluene solution is dried over5 gof anhydrous sodium sulfateand filtered. The filtrate is concentrated by distillation at reduced pressure using a water aspirator. The residue is distilledthrough a 10-cm. Vigreux column with warm watercirculating through the condenser, to preventcrystallization of the distillate, yielding 12.5–16.2 g (64–83%) of 3,4,5-trimethoxybenzaldehyde, b.p. 158–161°C(7–8 mmHg.), m.p. 74–75°C.