Abstract: (C38H40O4)n (MW [560.72]n) (used as an easily recyclable ligand for asymmetric Lewis acid catalysis) Solubility: soluble in chloroform, methylene chloride, THF, and toluene. Insoluble in alcohols, H2O, and hexane. Form Supplied in: yellow solid. Preparative Methods: 1, 2 prepared from the Suzuki coupling of the phenylenediboronic acid1 with the optically pure binaphthyl monomer (R)- or (S)-2, made from optically pure 1,1′-bi-2-naphthol (BINOL), followed by acid hydrolysis. By using either Pd(OAc)2 or Pd(PPh3)4 as the catalyst, 3,3′-polyBINOL was obtained with a molecular weight in the range of MW = 6700 to 24 300 (polydispersity index = 1.5–2.5) as determined by gel permeation chromatography relative to polystyrene standard. It was purified by repeated precipitation with methanol from a methylene chloride solution. (1) Handling, Storage, and Precautions: for long-term storage, keep in closed bottle in the absence of light.
Publication Year: 2002
Publication Date: 2002-04-15
Language: en
Type: reference-entry
Indexed In: ['crossref']
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