(Hive Bee)
07-21-03 19:32
No 448839
      Onium salts on catalyst improve stereoselectivity
(Rated as: excellent)

The action of onium salts and other modifiers on Pt/C, Pd/C, and Raney–Ni catalysts in the multiphase reduction system

Reactive and Functional Polymers
Volume 54, Issues 1-3 ,   January 2003,   Pages 95-101
(free PDF, DOI won't work so, just select the volume and issue)

In the presence of a catalyst modifier (an onium salt, an amine, or a polyethylene glycol), in a biphasic aqueous–organic mixture, the reactivity of Pt/C, Pd/C, and Raney–Ni changes significantly. Hydrodehalogenation reactions of halo aromatics, reductions of functional groups on the aromatic ring, benzyl hydrogenolysis, can be conducted under mild conditions, and with interesting rates and regio-, chemo-, and stereoselectivities. The modifier coats the catalyst, and forms an interfacial film, wherein the reactions take place. This film partitions the catalyst at the aqueous–organic interface, and influences the outcome of the reactions by mediating substrate–catalyst interactions, and by providing a hydrogen reservoir in the vicinity of the active sites.

We're  all in this world together,
07-21-03 20:36
No 448852
      10.1016/S1381-5148(02)00185-2  Bookmark   

(Hive Bee)
07-21-03 21:56
No 448867
      RE: DOI number....  Bookmark   

I know it has a DOI #  but because it's free it won't let you have it going after it that way, therefore one has to go through the link I gave then select it there least it does't work for me going after it through the DOI

We're  all in this world together,