ORGLIST: Re: Pd as a Catalyst

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From: by way of Joao Aires de Sousa (atlantis$##$netcom.com)
Date: Fri Apr 18 1997 - 18:27:19 EDT


Dear Dave,

When Pd on Carbon is used as a catalyst for a hydrogenation reaction,
alkenes and alkynes will be reduced to alkanes. A Lindlar Catalyst is
palladium metal finely divided and precipitated onto a calcium carbonate
support. This is treated and deactivated with lead acetate and and
aromatic amine called quinoline. The main difference with a Lindlar
Catalyst is that when it is used to treat an alkyne, it will result in an
alkene with the hydrogens attached in a cis configuration. With normal
hydrogen over Pd/C, the alkyne would have been completely reduced to an
alkane. The Lindlar Catalyst is important for synthesizing certain cis
isomers of target compounds. Hope this helps. Good luck on your final.

Sincere regards,
JJ Miranda
atlantis$##$netcom.com
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