申请人:Montedison S.p.A.
公开号:US04290961A1
公开(公告)日:1981-09-22
Catalytic reduction of carbonyl compounds by transfer of hydrogen from alcohols to aliphatic, alicyclic, aromatic, homo- and heterocyclic ketones or aldehydes, catalyzed by rhodium or iridium complexes, characterized in that a primary or secondary alcohol of formula (I) or a glycol: ##STR1## is reacted with a ketonic compound of formula (II): ##STR2## in which R and R' and, respectively, R" and R'", optionally linked with each other according to homo- or heterocycles, indifferently represent a hydrogen atom or a hydrocarbyl group having up to 30 atoms of carbon, also substituted, provided that at least one of symbols R" and/or R'" is different respectively from R and/or R', in the presence of a complex catalyst of rhodium or of iridium selected from those having formulas (III) and (IV): ##STR3## wherein: M is selected from Rh and Ir; Chel is a chelating bidentate nitrogenous compound; L-L is a molecule of a preferably non-conjugated diolefin or two molecules of a monoolefin; X.sup.- is an anion selected from amongst Cl.sup.-, Br.sup.-, J.sup.-, PF.sub.6.sup.-, BF.sub.4.sup.-, C10.sub.4.sup.-, B(C.sub.6 H.sub.5).sub.4.sup.- ; Y is a halogen, preferably it is Cl or Br; n is an integer from 0 to 3; and of a compound selected from amongst mineral alkalis and tertiary amines at a temperature ranging from about 20.degree. C. to the boiling temperature of the reaction mass, preferably in an inert atmosphere. The products obtained are employed as intermediates for organic syntheses in the field of fine chemicals. Some terms of the classes of catalysts herein described are to be considered as new in themselves.
通过从醇向脂肪族、环状、芳香族、同、异环酮或醛中转移氢来催化还原羰基化合物,催化剂为铑或铱配合物,其特征在于在铑或铱的配合物催化下,以式(I)的一级或二级醇或乙二醇:##STR1## 与式(II)的酮化合物反应:##STR2## 其中R和R'及R"和R'",分别与自己或根据同、异环之间的键连接,可以表示氢原子或具有高达30个碳原子的烃基,也可以表示取代基,只要至少有一个符号R"和/或R'"与R和/或R'分别不同,同时在铑或铱的复合催化剂的存在下,所选铑或铱的配合物具有式(III)和(IV):##STR3## 其中:M选自Rh和Ir;Chel是一种螯合的双齿氮化合物;L-L是一分子非共轭二烯或两分子单烯;X.sup.-是从Cl.sup.-、Br.sup.-、J.sup.-、PF.sub.6.sup.-、BF.sub.4.sup.-、C10.sub.4.sup.-、B(C.sub.6 H.sub.5).sub.4.sup.-中选择的阴离子;Y是卤素,最好是Cl或Br;n是从0到3的整数;以及从矿物碱和三级胺中选择的化合物,在温度范围内进行反应,该温度范围从大约20℃到反应物的沸点,最好在惰性气氛中。所得到的产物作为有机合成的中间体在精细化学品领域中使用。本文所述催化剂类别的一些术语本身也应视为新颖的。