Efficient 1,4-addition of enones and boronic acids catalyzed by a Ni-Zn hydroxyl double salt-intercalated anionic rhodium(III) complex

Takayoshi Hara, Nozomi Fujita, Nobuyuki Ichikuni, Karen Wilson, Adam F. Lee, Shogo Shimazu*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Intercalation of an in situ prepared [Rh(OH)6]3- complex into an anion exchangeable Ni-Zn layered hydroxy double salt (Rh/NiZn) was demonstrated. The resulting Rh/NiZn effectively catalyzed the 1,4-addition of diverse enones and phenylboronic acids to their corresponding β-substituted carbonyl compounds. In the case of 2-cyclohexen-1-one and phenylboronic acid, a turnover frequency (TOF) of 920 h-1 based on Rh was achieved. The [Rh(OH)6]3- complex maintained its original monomeric trivalent state within the NiZn interlayer following catalysis, attributable to a strong electrostatic interaction between the NiZn host and anionic Rh(III) complex.

Original languageEnglish
Pages (from-to)4040-4046
Number of pages7
JournalACS Catalysis
Volume4
Issue number11
Early online date6 Oct 2014
DOIs
Publication statusPublished - 7 Nov 2014

Bibliographical note

Funding: Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology of Japan (25420824); Photon Factory (KEK-PF, Proposal No. 2012G596; EPSRC (EP/G007594/4); and Royal
Society (Industry Fellowship).

Keywords

  • 1,4-addition
  • anion exchange
  • intercalation
  • Ni-Zn hydroxyl double salt
  • rhodium

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