A Family of Thiazolium Salt Derived N-Heterocyclic Carbenes (NHCs) for Organocatalysis: Synthesis, Investigation and Application in Cross-Benzoin Condensation
作者:Isabel Piel、Marius D. Pawelczyk、Keiichi Hirano、Roland Fröhlich、Frank Glorius
DOI:10.1002/ejoc.201100870
日期:2011.10
A family of thiazolium salt derived N-heterocycliccarbenes (NHCs) bearing sterically demanding aryl substituents on the nitrogen and with varying backbone substitution patterns have been synthesized. Investigation of the catalytic activity of these NHCs in a number of benzoin-type coupling reactions revealed markedly different levels of reactivity and selectivity. To elucidate the underlying factors
This invention provides fragrance compositions comprising a carrier solution used for cleaning purposes or for topical administration and nonfragrant photoresponsive agents that are capable of undergoing intramolecular photorearrangements to release a fragrance. The photoresponsive fragrance composition may comprise the prephotorearrangement first fragrance agent, the photorearranged and released fragrance agent, a combination of the first and second agents, or any of the above in combination with a known fragrance agent.
NOVEL POLYIMIDE PRECURSOR COMPOSITION AND USE THEREOF
申请人:Fujihara Kan
公开号:US20100132989A1
公开(公告)日:2010-06-03
An object of the present invention is to provide a polyimide precursor composition solution that (i) uses no siloxane diamine, (ii) is curable at low temperature (not more than 250° C.) and (iii) has low viscosity regardless of its high concentration, and a photosensitive resin composition, photosensitive resin film, a thermosetting resin composition, a polyimide insulating film, and a printed wiring board with an insulating film, each of which has good physical properties and is obtained by use of the polyimide precursor composition solution. The foregoing object is attained by using a polyimide precursor composition solution which includes at least a (A) urethane imide oligomer having a terminal carboxylic acid group and a (B) diamino compound and/or isocyanate compound.
NOVEL PHOTOSENSITIVE RESIN COMPOSITION AND USE THEREOF
申请人:Sekito Yoshihide
公开号:US20140069702A1
公开(公告)日:2014-03-13
The photosensitive resin composition contains a (A) binder polymer, (B) cross-linked polymer particles, (C) thermosetting resin, (D) photo-polymerization initiator, and a (E) phosphoric flame retardant, in which a content of the (B) cross-linked polymer particles is 30 parts by weight to 100 parts by weight with respect to the 100 parts by weight of the (A) binder polymer, and an average particle diameter of the (B) cross-linked polymer particles is 1 μm to 10 μm. Therefore, the photosensitive resin composition (i) obtains an excellent tack-free property after being applied and dried, (ii) can be subjected to fine processing, (iii) is formed into a cured film having excellent flexibility, flame retardancy, and electrical insulation reliability, and (iv) causes a substrate to have a small warpage after being cured.
Photosensitive resin composition and photosensitive element using the same
申请人:Hitachi Chemical Co., Ltd.
公开号:EP0373952A2
公开(公告)日:1990-06-20
A photosensitive resin composition comprising a photoinitiator and polymer containing a repeating unit of formula (I)
wherein R1 is a tetravalent organic group, R2 is a divalent organic group, either one or both of R1 and R2 contains at least one silicon atom and/or at least one fluorine atom, Y, is a monovalent group having an ethylenic unsaturated group; n is zero or 1, m is 1 or 2, and n + m = 2.