Synthesis and catalytic properties of cationic palladium(II) and rhodium(I) complexes bearing diphosphinidinecyclobutene ligands

Rader S. Jensen, Kazutoshi Umeda, Masaaki Okazaki, Fumiyuki Ozawa, Masaaki Yoshifuji

    Research output: Contribution to journalArticle

    20 Citations (Scopus)

    Abstract

    Cationic palladium(II) and rhodium(I) complexes bearing 1,2-diaryl-3,4-bis[(2,4,6-tri-t-butylphenyl)phosphinidene]cyclobutene ligands (DPCB-Y) were prepared and their structures and catalytic activity were examined (aryl = phenyl (DPCB), 4-methoxyphenyl (DPCB-OMe), 4-(trifluoromethyl)phenyl (DPCB-CF3)). The palladium complexes [Pd(MeCN)2(DPCB-Y)]X2 (X = OTf, BF4, BAr4 (Ar = 3,5-bis(trifluoromethyl)phenyl)) were prepared by the reactions of DPCB-Y with [Pd(MeCN)4]X2, which were generated from Pd(OAc)2 and HX in MeCN. On the other hand, the rhodium complexes [Rh(MeCN)2(DPCB-Y)]OTf were prepared by the treatment of [Rh(μ-Cl)(cyclooctene)2]2 with DPCB-Y in CH2Cl2, followed by treatment with AgOTf in the presence of MeCN. The cationic complexes catalyzed conjugate addition of benzyl carbamate to α,β-unsaturated ketones.

    Original languageEnglish
    Pages (from-to)286-294
    Number of pages9
    JournalJournal of Organometallic Chemistry
    Volume692
    Issue number1-3
    DOIs
    Publication statusPublished - 2007 Jan 1

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    Bearings (structural)
    Rhodium
    Palladium
    rhodium
    palladium
    Ligands
    ligands
    Carbamates
    synthesis
    Ketones
    ketones
    catalytic activity
    Catalyst activity

    Keywords

    • Cationic complex
    • Conjugate addition to enones
    • Low-coordinated phosphorus ligand
    • Palladium
    • Rhodium

    ASJC Scopus subject areas

    • Chemical Engineering (miscellaneous)
    • Materials Science (miscellaneous)
    • Materials Chemistry
    • Physical and Theoretical Chemistry
    • Organic Chemistry
    • Inorganic Chemistry
    • Biochemistry

    Cite this

    Synthesis and catalytic properties of cationic palladium(II) and rhodium(I) complexes bearing diphosphinidinecyclobutene ligands. / Jensen, Rader S.; Umeda, Kazutoshi; Okazaki, Masaaki; Ozawa, Fumiyuki; Yoshifuji, Masaaki.

    In: Journal of Organometallic Chemistry, Vol. 692, No. 1-3, 01.01.2007, p. 286-294.

    Research output: Contribution to journalArticle

    Jensen, Rader S. ; Umeda, Kazutoshi ; Okazaki, Masaaki ; Ozawa, Fumiyuki ; Yoshifuji, Masaaki. / Synthesis and catalytic properties of cationic palladium(II) and rhodium(I) complexes bearing diphosphinidinecyclobutene ligands. In: Journal of Organometallic Chemistry. 2007 ; Vol. 692, No. 1-3. pp. 286-294.
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    abstract = "Cationic palladium(II) and rhodium(I) complexes bearing 1,2-diaryl-3,4-bis[(2,4,6-tri-t-butylphenyl)phosphinidene]cyclobutene ligands (DPCB-Y) were prepared and their structures and catalytic activity were examined (aryl = phenyl (DPCB), 4-methoxyphenyl (DPCB-OMe), 4-(trifluoromethyl)phenyl (DPCB-CF3)). The palladium complexes [Pd(MeCN)2(DPCB-Y)]X2 (X = OTf, BF4, BAr4 (Ar = 3,5-bis(trifluoromethyl)phenyl)) were prepared by the reactions of DPCB-Y with [Pd(MeCN)4]X2, which were generated from Pd(OAc)2 and HX in MeCN. On the other hand, the rhodium complexes [Rh(MeCN)2(DPCB-Y)]OTf were prepared by the treatment of [Rh(μ-Cl)(cyclooctene)2]2 with DPCB-Y in CH2Cl2, followed by treatment with AgOTf in the presence of MeCN. The cationic complexes catalyzed conjugate addition of benzyl carbamate to α,β-unsaturated ketones.",
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    AU - Yoshifuji, Masaaki

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    AB - Cationic palladium(II) and rhodium(I) complexes bearing 1,2-diaryl-3,4-bis[(2,4,6-tri-t-butylphenyl)phosphinidene]cyclobutene ligands (DPCB-Y) were prepared and their structures and catalytic activity were examined (aryl = phenyl (DPCB), 4-methoxyphenyl (DPCB-OMe), 4-(trifluoromethyl)phenyl (DPCB-CF3)). The palladium complexes [Pd(MeCN)2(DPCB-Y)]X2 (X = OTf, BF4, BAr4 (Ar = 3,5-bis(trifluoromethyl)phenyl)) were prepared by the reactions of DPCB-Y with [Pd(MeCN)4]X2, which were generated from Pd(OAc)2 and HX in MeCN. On the other hand, the rhodium complexes [Rh(MeCN)2(DPCB-Y)]OTf were prepared by the treatment of [Rh(μ-Cl)(cyclooctene)2]2 with DPCB-Y in CH2Cl2, followed by treatment with AgOTf in the presence of MeCN. The cationic complexes catalyzed conjugate addition of benzyl carbamate to α,β-unsaturated ketones.

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