Re: ORGLIST: Platinum

Date view Thread view Subject view Author view Attachment view

From: Jonas Nilsson (jonni$##$ifm.liu.se)
Date: Fri Jan 26 2001 - 10:29:05 EST


Is it true that phenyl rings might be readily reduced at atmospheric
pressure by H2/Pt?
/jN
 _____________________ _____________________
| Jonas Nilsson | | |
|Linkoping University | | Telephone |
| IFM | | --------- |
| Dept. of Chemistry | | work: +46-13-285690 |
| 581 83 Linkoping | | fax: +46-13-281399 |
| Sweden | | home: +46-13-130294 |
|_____________________| |_____________________|
----- Original Message -----
From: "Chris Borella" <cborella$##$ic.sunysb.edu>
To: "Jonas Nilsson" <jonni$##$ifm.liu.se>
Sent: Friday, January 26, 2001 4:07 PM
Subject: Re: ORGLIST: Platinum


> Hi,
> I have used Pt on carbon a couple of times and never had any problem with
it
> combusting. As far as the selectivity I am not sure but it will
hydrogenate
> most phenyl rings to cyclohexanes readily.

> From: Jonas Nilsson <jonni$##$ifm.liu.se>
> To: Multiple recipients of list orglist <orglist$##$dq.fct.unl.pt>
> Sent: Friday, January 26, 2001 3:19 AM
> Subject: ORGLIST: Platinum
>
> > Hi
> > When handling Palladium (5% on activated carbon) in small amounts
(<10mg),
> > my experience tells me that there is seldom any problem with spontanious
> > combustion, and the need for caution is quite limited.
> >
> > Now, I need to use Platinum (5% on activated carbon) and there is a
large
> > warninglabel stating spontanious combustion on the package. Is the need
> for
> > caution more pronounced for Platinum than for Palladium?
> >
> > And another question:
> > Is there a general trend of activity or selectivity that you know of
using
> > Palladium or Platinum for catalytic hydrogenation. The functionalities
> which
> > are the concern are Cbz protectiongroups, aldehydes, imines and
> hydrazones.
> > Any difference in reactivity using Pd or Pt?
> >
> > /jN


__________________

ORGLIST - Organic Chemistry Mailing List
Website / Archive / FAQ: http://www.orglist.net/
List coordinator: Joao Aires de Sousa (jas$##$mail.fct.unl.pt)




Date view Thread view Subject view Author view Attachment view

This archive was generated by hypermail 2.1.4 : Fri Sep 19 2003 - 12:16:27 EDT