21473-04-1Relevant articles and documents
Ammonium Salt-Catalyzed Highly Practical Ortho-Selective Monohalogenation and Phenylselenation of Phenols: Scope and Applications
Xiong, Xiaodong,Yeung, Ying-Yeung
, p. 4033 - 4043 (2018/05/22)
An ortho-selective ammonium chloride salt-catalyzed direct C-H monohalogenation of phenols and 1,1′-bi-2-naphthol (BINOL) with 1,3-dichloro-5,5-dimethylhydantoin (DCDMH) as the chlorinating agent has been developed. The catalyst loading was low (down to 0.01 mol %) and the reaction conditions were very mild. A wide range of substrates including BINOLs were compatible with this catalytic protocol. Chlorinated BINOLs are useful synthons for the synthesis of a wide range of unsymmetrical 3-aryl BINOLs that are not easily accessible. In addition, the same catalytic system can facilitate the ortho-selective selenylation of phenols.
Synthetic approaches to zigzag-shaped oligophenylene strands laterally decorated with hydroxy functions
Diebold, Carine,Weekes, David Michael,Torres Navarrete, Maria,Mobian, Pierre,Kyritsakas, Nathalie,Henry, Marc
experimental part, p. 6949 - 6956 (2011/02/25)
Two nanosized zigzag-shaped oligophenylene strands incorporating 2,2′-biphenol units were prepared by Suzuki-Miyaura coupling methodology. The two strands are made up of ten and seven phenyl rings, respectively. Two synthetic pathways were evaluated. The
New carbohydrate bisphosphites as chiral ligands
Kadyrov, Renat,Heller, Detlef,Selke, Ruediger
, p. 329 - 340 (2007/10/03)
The synthesis of the 2,3-bisphosphite derivatives of phenyl 4,6-O-benzylidene-β-D-glucopyranoside leads to new chelating ligands. Their rhodium(I) and platinum(II) complexes have been tested as catalysts for the asymmetric hydroformylation of vinyl acetate, allyl acetate and p-methoxystyrene. Good regioselectivity (>90% branched product), but an enantioselectivity of only ≤36% ee were found under mild reaction conditions (25-40°C, 40-70 bar syngas).
