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Scheme 3 Synthesis of 6Ni from 5Ni.
Conclusions
2
2-Borylporphyrins reacted with Pt(cod)Cl in the presence of
cesium uoride to produce b-to-b platinum-bridged porphyrin
dimers, which were converted to b–b directly linked porphyrin
dimers through triphenylphosphine-mediated reductive elimi-
nation. A similar reaction of 2,18-diborylated Ni(II)–porphyrin
gave a doubly b-to-b platinum-bridged Ni(II)–porphyrin dimer,
which was converted to a Ni(II)–porphyrin dimer bearing a b-to-
b platinum-bridge and a b-to-b direct C–C bond via similar
reductive eliminations. These platinum-bridged porphyrin
dimers display characteristic electronic and optical properties.
Further extension of this strategy to longer porphyrin arrays is
now in progress in our laboratory.
9
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Acknowledgements
This work was supported by JSPS KAKENHI Grant Numbers
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MALDI-TOF MS measurement.
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Chem. Sci.
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