Res. Chem. Intermed.
, Vol. 29, No. 3, pp. 285– 291 (2003)
Also available online - www.vsppub.com
Heterogenous catalysis in ne chemistry: the Heck reaction
on Pd /SiO
, S. COLUCCIA
, R. MAGGI
, G. MARTRA
, A. MAZZACANI
and G. SARTORI
Dipartimento di Chimica Organica e Industriale, Università di Parma,
Parco Area delle Scienze 17A, 43100 Parma, Italy
Dipartimento di Chimica IFM, Università di Torino, Via P. Giuria 7, 10125 Torino, Italy
Received 27 August 2002; accepted 15 January 2003
Abstract—The preparation conditions to obtain a Pd/SiO
catalyst effective in the Heck reaction
-substituted halogenobenzeneand alkylacrylate have been studied. The impregnation of
, functionalised with a thiourea derivative, with a Pd(CH
solution resulted in an active,
but unstable catalyst. The catalyst became stable after calcination, but its activity appeared to be
strongly dependent on the calcination temperature. IR spectra of adsorbed CO indicated that such a
dependence should result from differences in the surface structure of the supported particles.
: Heck reaction; Pd/SiO
catalysts; TEM; IR spectra; adsorbed CO.
To face the demanding challenge for preventing pollution from chemical produc-
tions, a relevant number of scienti c investigations have been exploited in or-
der to design heterogeneous catalysts effective for more environmentally friendly
processes, mainly intended for large chemical productions. Big efforts are currently
done to use heterogeneous catalysts also to produce ne chemicals. In this eld, pal-
ladium is arguably the most versatile and the most widely applied catalytic metal .
However, the applications of heterogeneous Pd catalysts in ne chemical synthesis
are not so numerous, and until a decade ago were restricted to hydrogenation and
dehydrogenation processes [2–4]. This situation has changed in the last few years,
and a number of applications of supported metallic Pd for C C bond forming trans-
formation have been proposed, as recently reviewed by Blaser et al. .
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