Development of an axially chiral sp3P/sp3NH/sp2N-combined linear tridentate ligand—fac-selective formation of Ru(II) complexes and application to ketone hydrogenation
A newly developed chiral linear tridentateligand, R-PN(H)N (R=H or Ph), possesses Ph2P and PyCH2NH groups at C(2) and C(2′) positions of the 1,1′-binaphthyl skeleton without or with a C(3)-Ph substituent. The steric effect of C(3)-Ph and the electronic effect of the DMSO co-ligand realize the facial selective generation of fac-RuCl2(Ph-PN(H)N)(dmso) and fac-[Ru(H-PN(H)N)(dmso)3](BF4)2, respectively
Face off: The rutheniumcomplexes of a new axially chiral PNN ligand (L) are highly efficient in the presence of dimethylsulfoxide (DMSO) for hydrogenation of both functionalized and unfunctionalized tert‐alkyl ketones. DMSO is thought to narrow down the many possible complex stereoisomers into a single facial L/Ru complex, thus enhancing the reactivity, selectivity, and productivity.
An AFM investigation revealed that air-dried cast films of tripeptide-containing amphiphiles had a flat texture with regular mesoscopic patterns.
原子力显微镜研究发现,风干的含三肽两亲化合物铸膜具有平整的纹理和规则的中观图案。
Enantio- and chemoselective bioreduction of β-keto nitriles by the fungus Curvularia lunata
作者:Juan R Dehli、Vicente Gotor
DOI:10.1016/s0957-4166(00)00348-7
日期:2000.9
The use of methanol as cosolvent allows the chemoselective reduction of aromatic beta -keto nitriles by the fungus Curvularia lunata CECT 2130, yielding the corresponding (S)-beta -hydroxy nitriles in a highly enantioselective way. (C) 2000 Elsevier Science Ltd. All rights reserved.