Selective Oxidative Homo- and Cross-Coupling of Phenols with Aerobic Catalysts
摘要:
Simple catalysts that use atom-economical oxygen as the terminal oxidant to accomplish selective ortho-ortho, ortho-para, or para-para homo-couplings of phenols are described. In addition, chromium salen catalysts have been discovered as uniquely effective in the cross-coupling of different phenols with high chemo- and regioselectivity.
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.