A highly regioselective nickel-based catalyst system for the isomerization/hydrocyanation of aliphatic internal olefins is described. This benign tandem reaction provides facile access to a wide variety of aliphatic nitriles in good yields with excellent regioselectivities. Thanks to Lewis acid-free conditions, the protocol features board functional groups tolerance, including secondary amine and unprotected
A regiodivergent nickel‐catalyzed hydrocyanation of a broad range of internal alkenes involving a chain‐walking process is reported. When appropriate diastereomeric biaryl diphosphite ligands are applied, the same starting materials can be converted to either linear or branched nitriles with good yields and high regioselectivities. DFT calculations suggested that the catalyst architecture determines
Bisphosphite compound, process for its production and hydroformylation
申请人:Mitsubishi Chemical Corporation
公开号:US05910600A1
公开(公告)日:1999-06-08
A bisphosphite compound of the following formula (A): ##STR1## wherein --Ar--Ar-- is a bisarylene group represented by any one of the formulae (A-I) to (A-III) defined in the specification, and each of Z.sub.1 to Z.sub.4 is a C.sub.4-20 aromatic or heteroaromatic group which may have a substituent, wherein each of substituents on carbon atoms of an aromatic ring adjacent to the carbon atom bonded to the oxygen atom in each of Z.sub.1 to Z.sub.4, is a C.sub.0-2 group, and each pair of Z.sub.1 and Z.sub.2, and Z.sub.3 and Z.sub.4, are not bonded to each other.
On phenanthrene-4,5-quinones: a synthesis of morphenol
作者:Frank R. Hewgill、Jeffery M. Stewart
DOI:10.1039/c39840001419
日期:——
1,3,6,8-Tetra-t-butyphenanthrene-4,5-quinone (10) has been prepared as a short-lived species in solution, and rapidly rearranges to a dienone (12) which on debutylation yields morphenol (14): the corresponding 9,10-dihydroquinone (6) crystallises as its oxepine valence isomer (7).