Cationic Rh complexes with novel spiro tetraarylpentaborate anions prepared from arylboronic acids and aryloxorhodium complexes

Yasushi Nishihara, Kyoko Nara, Yasuhiro Nishide, Kohtaro Osakada

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18 Citations (Scopus)


Ar-B(OH)2 (1a: Ar = C6H4OMe-4, 1b: Ar = C6H3Me2-2,6) react immediately with Rh(OC 6H2Me-4)(PMe3)3 (2) in 5 : 1 molar ratio at room temperature to generate [Rh(PMe3)4] +[B5O6Ar4]- (3a: Ar = C6H4OMe-4, 3b: Ar = C6H3Me 2-2,6). p-Cresol (92%/Rh), anisole (80%/Rh) and H2O (364%/Rh) are formed from 1a and 2. The reaction of 1a with 2 for 24 h produces [Rh(PMe3)4]-[B5O6(OH) 4]- (4) as a yellow solid. This is attributed to hydrolytic dearylation of once formed 3a because the direct reaction of 3a with excess H2O forms 4. An equimolar reaction of 2 with phenylboroxine (PhBO)3 causes transfer of the 4-methylphenoxo ligand from rhodium to boron to produce [Rh(PMe3)4]+[B 3O3Ph3(OC6H4Me-4)] - (5). Arylboronic acids 1a and 1b react with Rh(OC6H 4Me-4)(PR3)3 (6: R = Et, 8: R = Ph.) and with Rh(OC6H4Me-4)(cod)(PR3) (11: R = iPr, 12: R = Ph) to form [Rh(PR3)4] +[B5O6Ar4]- (7a: R = Et, Ar = C6H4OMe-4, 7b: R = Et, Ar = C6H 3Me2-2,6, 9a: R = Ph, Ar = C6H 3Me2-2,6) and [Rh(cod)(PR3)(L)] +[B5O6Ar4]- (13b: R = iPr, L = acetone, Ar = C6H3Me2-2,6, 14a: R = Ph, L = PPh3, Ar = C6H4OMe-4, 14b: R = Ph, L = PPh3, Ar = C6H3Me2-2,6), respectively. Hydrolysis of 14a yields [Rh(cod)(PPh3) 2]-[B5O6(OH)4] - (15) quantitatively.

Original languageEnglish
Pages (from-to)1366-1375
Number of pages10
JournalDalton Transactions
Issue number9
Publication statusPublished - May 7 2004
Externally publishedYes



  • Boron
  • Boron-containing compounds
  • P-containing ligands
  • Rhodium
  • Transition metals

ASJC Scopus subject areas

  • Chemistry(all)

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