Journal Article Regioselective phenylene-fusion reactions of Ni(II)-porphyrins controlled by an electron-withdrawing: Meso -substituent

Fukui, Norihito  ,  Lee, Seung Kyu  ,  Kato, Kenichi  ,  Shimizu, Daiki  ,  Tanaka, Takayuki  ,  Lee, Sangsu  ,  Yorimitsu, Hideki  ,  Kim, Dongho  ,  Osuka, Atsuhiro

7pp.4059 - 4066 , 2016-03-01 , Royal Society of Chemistry
ISSN:2041-6539
Description
Oxidation of 10, 15, 20-triaryl Ni(ii)-porphyrins bearing an electron-withdrawing substituent at the 5-position with DDQ and FeCl3 gave 10, 12- and 18, 20-doubly phenylene-fused Ni(ii)-porphyrins regioselectively. A doubly phenylene-fused meso-chloro porphyrin thus prepared was reductively coupled to give a meso-meso linked dimer, which was further converted to a quadruply phenylene-fused meso-meso, β-β, β-β triply linked Zn(ii)-diporphyrin via inner-metal exchange followed by oxidation with DDQ and Sc(OTf)3. As compared to the usual meso-meso, β-β, β-β triply linked Zn(ii)-diporphyrin, this π-extended porphyrin dyad exhibits a smaller HOMO-LUMO gap and a larger two-photon absorption cross-section.
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http://repository.kulib.kyoto-u.ac.jp/dspace/bitstream/2433/216557/1/c5sc04594k.pdf

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