7. Conclusions
New tetraruthenated porphyrins were synthesized, char-
acterized and their catalytic properties on oxidation of
cyclohexanone and cyclohexane were evaluated. The prop -
erties of the porphyrins are practically not dependent on
the characteristics of peripheral ruthenium complexes con-
taining substituted bipyridines. The catalytic results
obtained in this work allows to suggest that the yield and
the selectivity of the products are modulated better by
the presence or absence of steric effect than by the elec-
tronic effect induced by the peripheral ruthenium com-
plexes on the central metal. The yield on epoxide is
decreased comparing the non-tetraruthenated porphyrin
with the tetraruthenated, but for cyclohexane the presence
of peripheral ruthenium complexes increase the yield on
cyclohexanol. The electron density of the manganese center
does not affect significantly the yield and selec tivity of the
products of the catalytic reactions. Probably this difference
on electron density of the metal center is not significant
after the formation of the real catalytic Mn
V
@O site, in
solution.
Acknowledgements
We thank CNPq, CAPES, FINEP, PRONEX and FA-
PESP for financial support and Johnson Matthey plc for
the loan of RuCl
3
(to M.P.A).
Appendix A. Supplementary material
CCDC 640693 contains the supplementary crystallo-
graphic data for cis-[RuCl(dppb)(bipy)(4-Mepy)]PF
6
.
These data can be obtained free of charge via http://
www.ccdc.cam.ac.uk/conts/retrieving.html, or from the
Cambridge Crystallograph ic Data Centre, 12 Union Road,
Cambridge CB2 1EZ, UK; fax: (+44) 1223-336-033; or
ciated with this article can be found, in the online version,
at doi:10.1016/j.poly.2007.08.021.
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