[4 + 2] Cycloaddition Reactions Catalyzed by a Chiral Oxazaborolidinium Cation. Reaction Rates and Diastereo-, Regio-, and Enantioselectivity Depend on Whether Both Bonds Are Formed Simultaneously
摘要:
The reaction rates and products in enantioselective Diels-Alder reactions with a range of dienophiles correlate with the expected degree of concertedness of bond formation in the transition state.
[4 + 2] Cycloaddition Reactions Catalyzed by a Chiral Oxazaborolidinium Cation. Reaction Rates and Diastereo-, Regio-, and Enantioselectivity Depend on Whether Both Bonds Are Formed Simultaneously
摘要:
The reaction rates and products in enantioselective Diels-Alder reactions with a range of dienophiles correlate with the expected degree of concertedness of bond formation in the transition state.
Graft copolymer, solution containing the graft copolymer, and method of treating contact lens with the solution
申请人:Tomei Sangyo Kabushiki Kaisha
公开号:EP0434362B1
公开(公告)日:1995-03-22
COPOLYMER AND POLYMERIZABLE COMPOSITION
申请人:Kyota Hirokazu
公开号:US20090116808A1
公开(公告)日:2009-05-07
A copolymer containing a repeating unit of formula (1) and a repeating unit of formula (2-1) or (2-2):
wherein R
1
and R
2
represent alkyl or aryl, R
3
represents alkyl, aryl, alkoxy or amino, R
5
and R
6
represent hydrogen, alkyl or aryl. The copolymer exhibits excellent mechanical properties, and capable of forming a coating film having low reflectivity.