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
The large cone angle and bite angle of the SRS ligand diastereomer in biphenol-based Rh-bisphosphite catalysts lead to high linear regioselectivity in the hydroformylation of propylene.
Epoxy resin composition for encapsulating semiconductor and semiconductor device
申请人:Kotani Takahiro
公开号:US20080128922A1
公开(公告)日:2008-06-05
There is provided an epoxy resin composition for encapsulating a semiconductor comprising an epoxy resin (A), wherein the epoxy resin (A) including: a crystalline epoxy resin (a
1
) having a melting point of 50° C. to 150° C., an epoxy resin (a
2
) represented by formula (1), and at least one epoxy resin (a
3
) selected from an epoxy resin represented by formula (2) and an epoxy resin represented by a formula (3):
in which R1's, which may be the same or different, represent a hydrocarbon group having 1 to 4 carbon atoms; R2's, which may be the same or different, represent a hydrogen atom or a hydrocarbon group having 1 to 4 carbon atoms; m is an integer of 0 to 5; and n is an integer of
0
to
6.
US8008410B2
申请人:——
公开号:US8008410B2
公开(公告)日:2011-08-30
[EN] OPTICALLY ACTIVE PHOSPHITES AND PHOSPHORAMIDITES BEARING BIPHENOL SKELETONS WITH AXIAL CHIRALITY, AND THEIR USE IN CATALYTIC ASYMMETRIC REACTIONS<br/>[FR] PHOSPHITES ET PHOSPHORAMIDITES OPTIQUEMENT ACTIFS ET DOTES D'UN SQUELETTE BIPHENOL A CHIRALITE AXIALE, LEUR UTILISATION DANS DES REACTIONS CATALYTIQUES ASYMETRIQUES
申请人:MITSUBISHI CHEM CORP
公开号:WO2004076464A2
公开(公告)日:2004-09-10
Novel optically active ligands which are mondentate phosphites and phosphoramidites, and bidentate phosphites and phosphoramidites; optically active catalysts comprising a reaction mixture of the ligand and a transition metal or its compound; and processes of using the optically active catalysts to produce optically active compounds.