task-specific ionic liquid via C(sp3)–O and C(sp2)–Obondcleavage of two different types of ethers for the assembly of structurally diverse 4-arylisoxazoles is described. Both the basic ionic liquid [C3NH2mim]Br and NHC–Pd catalyst IPr–Pd–Im–Cl2 played an important role in this transformation. Notably, this new approach provides a practical and straightforward route to access a broad range of privileged 4-arylisoxazole
NOVEL DIHYDRAZIDES AS DOT-PROMOTING AGENTS IN PHOTOGRAPHIC IMAGE SYSTEMS
申请人:INTERNATIONAL PAPER COMPANY
公开号:EP0797789B1
公开(公告)日:1998-11-25
US3932388A
申请人:——
公开号:US3932388A
公开(公告)日:1976-01-13
US4698091A
申请人:——
公开号:US4698091A
公开(公告)日:1987-10-06
[EN] CONJUGATED POLYVIOLOGEN DERIVATIVES<br/>[FR] DÉRIVÉS CONJUGUÉS DE POLYVIOLOGÈNE
申请人:AGENCY SCIENCE TECH & RES
公开号:WO2018021970A1
公开(公告)日:2018-02-01
The present invention relates to an acceptor-acceptor type conjugated polymer that is an n-type conducting polymer having the following Formula (I): wherein Q is a bond, an optionally substituted aryl or an optionally substituted heteroaryl; A1 and A2 are independently hydrogen, halogen or an optionally substituted alkyl, or any two A1 may optionally be taken together to form an optionally substituted aryl; Ar is an optionally substituted electron deficient aryl that is N-conjugated directly to the pyridyl group; Y is a counterion; and n is an integer ranging from 5 to 100. The polymer of Formula (I) has a low LUMO value, and a high electron conductivity and air or oxygen stability. The present invention also relates to a method of synthesizing said polymer, and the use of said polymer. In a preferred embodiment, 2,6-dibromo-N,N'-bis(2-ethylhexyl)-1,8:4,5- naphthalene tetracarboxdiimide was reacted with 4,4'-bipyridine to form a conjugated polyviologen derivative in which the viologen unit covalently linked directly to an aromatic electron acceptor via the nitrogen atoms.