Hydrophobic vitamin B12. VII. ring-expanison reactions catalyzed by hydrophobic vitamin B12 in octopus azaparacyclophane

Yukito Murakami, Yoshio Hisaeda, Teruhisa Ohno

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Ring-expansion reactions of alkyl ligands bound to heptapropyl cobyrinate at the axial site of the nuclear cobalt were found to be markedly favoured in the hydrophobic cavity of an octopus azaparacyclophane, relative to reactions in methanol and benzene, under anaerobic photolysis conditions at 20.0°C. Heptapropyl cobyrinate perchlorate catalyzed the same ring-expansion reactions, which convert 2-methyl-1,3-cydopentanedione and 3-methyl-2-pyrrolidinone into 1,4-cyclohexanedione and 2-piperidinone, respectively, in the octopus cyclophane by utilizing vanadium trichloride as a co-catalyst under aerobic photolysis conditions.

Original languageEnglish
Pages (from-to)13-22
Number of pages10
JournalJournal of Coordination Chemistry
Issue number1
Publication statusPublished - Jan 1 1990

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Materials Chemistry

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