Journal
LETTERS IN ORGANIC CHEMISTRY
Volume 11, Issue 10, Pages 748-754Publisher
BENTHAM SCIENCE PUBL LTD
DOI: 10.2174/157017861110141117143729
Keywords
Metathesis activity; natural rubber; ruthenium vinylidene; synthesis
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Funding
- National Council for Science and Technology of Mexico (CONACyT)
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The synthesis of three new ruthenium vinylidene complexes I-III with general formula [RuCl2 (=C=CHR)(PCy3)(2)] (R= p-C6H4CF3 (I), p-C6H4F (II) and C6H9 (III)) has been reported. The vinylidene complexes were isolated as crystalline solids and characterized by H-1, C-13, F-19 and P-31 NMR, FT-IR spectroscopy, X-ray diffraction and elemental analyses. Due to the electronic repulsion between the chlorines and the steric repulsion between the cyclohexyl ring of PCy3 and the substituent on the vinylidene ligand, the complexes I-III showed a distorted square-pyramidal structure. These complexes exhibited the high catalytic efficiency in the cross-metathesis degradation of challenging natural rubber (NR) in the presence of d-limonene and citrus oils as chain transfer agents.
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