120967-70-6

Basic information

• Product Name: Cyclooctadiene(hydroquinone)rhodium(I)tetrafluoroborate
• Synonyms: Cyclooctadiene(hydroquinone)rhodium(I)tetrafluoroborate;1,5-Cyclooctadiene(hydroquinone)rhodium(I) tetrafluoroborate
• CAS NO: 120967-70-6
• Molecular Formula: BF₄*C₁₄H₁₈O₂Rh
• Molecular Weight: 0
• Product Categories: organometallic complex;Rh
• Mol File: 120967-70-6.mol
• Article Data: 3

Chemical Properties

• Appearance: yellow/Powder
• CAS DataBase Reference: Cyclooctadiene(hydroquinone)rhodium(I)tetrafluoroborate(CAS DataBase Reference)
• NIST Chemistry Reference: Cyclooctadiene(hydroquinone)rhodium(I)tetrafluoroborate(120967-70-6)
• EPA Substance Registry System: Cyclooctadiene(hydroquinone)rhodium(I)tetrafluoroborate(120967-70-6)

Safety Data

• Hazardous Substances Data: 120967-70-6(Hazardous Substances Data)

Usage

Reactions

A phosphorous free pre-catalyst for the efficient 1,4-conjugate addition of arylboronic acids to enones. A pre-catalyst for addition of arylboronic acids to aryl aldehydes. With aluminum isopropoxide forms a self-supported heterogeneous catalyst for the stereoselective polymerization of phenylacetylene to cis-poly(phenylacetylene).

Upstream product

• 67969-82-8 tetrafluoroboric acid diethyl ether 
• 31798-33-1 (η3-cyclooctenyl)(η2,η2-cyclooctadiene-1,5)rhodium 
• 123-31-9 hydroquinone 

Relevant articles and documents

Method of using rhodium quinonoid catalysts

In accordance with aspects of the invention methods of using rhodium hydroquinone catalysts for the conjugate addition of boronic acids are disclosed.

Synthesis and properties of some new (η6-arene)cobalt complexes

The preparation of several new types of (η6-arene)cobalt complexes is described. (η3-Cyclooctenyl)(η2,η 2-cyclooctadiene)cobalt (1) reacts with H2 in the presence of arenes and N bases such as piperidine to form (η6-arene)(η1,η 2-cyclooctenyl)cobalt complexes (2). The structure of the 1-η1,4,5-η2-cyclooctenyl ligand was determined by 2D NMR techniques. Complexes 2 react with HBF4·Et2O in the presence of dienes to give (η6-arene)(diene)cobalt tetrafluoroborates (5, 6, 8, 10), which in turn react with NaBEt3H to afford (η6-arene)(η3-allyl)cobalt complexes. When the latter are treated with HBF4·Et2O in the presence of dienes, then (η6-arene)(diene)cobalt tetrafluoroborates are re-formed. (η6-Arene)(butadiene)cobalt tetrafluoroborates can be prepared by treating (5-methylheptadienyl)(η4-butadiene)cobalt with HBF4·Et2O in the presence of arenes. The reaction of 1 with HBF4·Et2O and arene results in the synthesis of (η6-arene)(η1,η 3-cyclooctenediyl)cobalt(III) tetrafluoroborate complexes (18). The NMR evidence for this structure is discussed. The arene ligand in 18 is easily displaced by acetonitrile to give (η1,η3-cyclooctenediyl)tris(acetonitrile)cobalt tetrafluoroborate (21), which is a versatile compound for the synthesis of neutral cobalt complexes with η1,η3-cyclooctenediyl ligands. The crystal structures of (η5-cyclopentadienyl)(η1,η 3-cyclooctenediyl)cobalt (22) and (acetylacetonato)(η1,η3-cyclooctenediyl)cobalt (23) were confirmed by X-ray diffraction techniques. Crystals of 22 are tetragonal, space group P4, with a = b = 16.583 (2) A?, c = 7.995 (1) A?, and Z = 8; R = 0.031 for 2525 unique observed reflections. Crystals of 23 are triclinic, space group P1, with a = 8.4165 (8) A?, b = 8.9539 (9) A?, c = 9.3770 (5) A?, α = 72.588 (5)°, β = 72.224 (5)°, γ = 70.521 (8)°, and Z = 2; R = 0.033 for 3160 unique observed reflections. Both complexes are monomeric and contain similar C8H12Co fragments.