Homogeneous Pd(OCOCF3)2/(R)-C4-TunePhos has been successfully applied in the asymmetrichydrogenation of simple ketones activated by catalytic amount of Brønstedacid with up to 88% ee.
Acceptorless Dehydrogenative Oxidation of Secondary Alcohols Catalysed by Cp*Ir<sup>III</sup>
-NHC Complexes
作者:Süleyman Gülcemal、Derya Gülcemal、George F. S. Whitehead、Jianliang Xiao
DOI:10.1002/chem.201601648
日期:2016.7.18
series of new IrIII complexes with carbeneligands that contain a range of benzyl wingtip groups have been prepared and fully characterised by NMR spectroscopy, HRMS, elemental analysis and X‐ray diffraction. All the complexes were active in the acceptorless dehydrogenation of alcohol substrates in 2,2,2‐trifluoroethanol to give the corresponding carbonyl compounds. The most active complex bore an electron‐rich
Expedient and efficient one pot synthesis of trifluoroethyl ethers from metal free 2,4,6-tris-(2,2,2-trifluoro-ethoxy)-[1,3,5] triazene
作者:Shrawan Kumar Mangawa、Chiranjeev Sharma、Ashawani kumar Singh、Satish K. Awasthi
DOI:10.1039/c5ra00618j
日期:——
An efficient synthesis of fluorinated alkyl and aryl ethers was achieved by the use of s-triazene derived fluorinated reagent 2,4,6-tris-(2,2,2-trifluoro-ethoxy)-[1,3,5] triazene (TriTFET).
BIS(FLUOROALKOXY)TRIPHENYLPHOSPHORANES: PREPARATION AND REACTIONS
作者:Toshio Kubota、Tomoya Kitazume、Nobuo Ishikawa
DOI:10.1246/cl.1978.889
日期:1978.8.5
Bis(fluoroalkoxy)triphenylphosphoranes were prepared by the replacement of bromines of triphenylphosphine dibromide by fluoroalkoxides [C6H5C(CF3)2ONa, and CF3CH2ONa]. Alcohols and carboxylic acids readily reacted with Ph3P(OCH2CF3)2 to form corresponding 2,2,2-trifluoroethyl ethers and esters, respectively. Ph3P(OC(CF3)2C6H5]2, however, was so stable that it did not undergo reactions with these hydroxyl
Markovnikov-Selective Addition of Fluorous Solvents to Unactivated Olefins Using a Co Catalyst
作者:Hiroki Shigehisa、Harue Kikuchi、Kou Hiroya
DOI:10.1248/cpb.c15-01024
日期:——
We developed an addition reaction of fluorous solvents to olefins using salen-cobalt (Co) complex, N-fluoro-2,4,6-trimethylpyridinium tetrafluoroborate, and 1,1,3,3-tetramethyldisiloxane. This reaction condition was found to activate olefins, which enabled them to be attacked by 2,2,2-trifluoroethanol (TFE) and 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP), both of which are electronically weak nucleophiles