Re: ORGLIST: Platinum

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From: Chris Borella (cborella$##$ic.sunysb.edu)
Date: Fri Jan 26 2001 - 10:58:31 EST


Yes, that is the only reaction we use it for. In our case we reduce a
benzoyl to a cyclohexoyl at atmospheric pressure and rt overnight (it might
actually be finished much sooner but we don't bother checking).

-chris
----- Original Message -----
From: Jonas Nilsson <jonni$##$ifm.liu.se>
To: Multiple recipients of list orglist <orglist$##$dq.fct.unl.pt>
Sent: Friday, January 26, 2001 10:29 AM
Subject: Re: ORGLIST: Platinum


> 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
>
>
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>
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