Isomeric N-(Nitrenophenyl)nitrenobenzamides. Comparison of the Energy Differences between Their Singlet and Quintet States Obtained Computationally and Experimentally
摘要:
The sign and magnitude of the intramolecular magnetic coupling between the two triplet nitrene units through the benzanilide chromophore have beep studied by temperature dependence of their EPR fine structures; The results that the interactions are ferromagnetic in the m,p' and m',p isomers and antiferromagnetic in the p,p' and m,m' isomers were corroborated by semiempirical CI calculations.
Inhibition studies on Mycobacterium tuberculosis N-acetylglucosamine-1-phosphate uridyltransferase (GlmU)
作者:Anh Thu Tran、Daying Wen、Nicholas P. West、Edward N. Baker、Warwick J. Britton、Richard J. Payne
DOI:10.1039/c3ob41896k
日期:——
Peptidoglycan is an essential component of the cell wall of bacteria, including Mycobacterium tuberculosis, that provides structural strength and rigidity to enable internal osmotic pressure to be withstood. The first committed step in the biosynthesis of peptidoglycan involves the formation of uridine diphosphate-N-acetylglucosamine (UDP-GlcNAc) from uridine triphosphate (UTP) and GlcNAc-1-phosphate. This reaction is catalysed by N-acetylglucosamine-1-phosphate uridyltransferase (GlmU), a bifunctional enzyme with two independent active sites that possess acetyltransferase and uridyltransferase activities. Herein, we report the first inhibition study targeted against the uridyltransferase activity of M. tuberculosis GlmU. A number of potential inhibitors were initially prepared leading to the discovery of active aminoquinazoline-based compounds. The most potent inhibitor in this series exhibited an IC50 of 74 μM against GlmU uridyltransferase activity and serves as a promising starting point for the discovery of more potent inhibitors.
A polyimide resin contains repeating structural units represented by formulas (1) and (2), wherein the content of the repeating structural unit represented by formula (2) relative to the total of the repeating structural unit represented by formula (1) and the repeating structural unit represented by formula (2) falls within a specific range and the content of the divalent group represented by the following structural formula (B1) falls within a specific range:
X
1
represents a tetravalent group containing an alicyclic hydrocarbon structure and having a carbon number of from 4 to 22. X
2
represents a tetravalent group containing an aromatic ring and having a carbon number of from 6 to 22. R
1
and R
2
each independently represent a divalent organic group, and the content of the divalent group represented by the following structural formula (B1) relative to the total of R
1
and R
2
is from 80 to 100 mol %:
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.
POLYIMIDE PRECURSOR, POLYIMIDE, AND MATERIALS TO BE USED IN PRODUCING SAME
申请人:Takasawa Ryoichi
公开号:US20130178597A1
公开(公告)日:2013-07-11
Disclosed is a novel co-polyimide precursor for producing a polyimide having high transparency. The co-polyimide precursor comprises a unit structure represented by general Formula (A1) and a unit structure represented by general Formula (A2):
wherein, in general Formula (A1), R
1
represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; and R
2
and R
3
each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkylsilyl group having 3 to 9 carbon atoms,
wherein, in general Formula (A2), R
4
represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; R
5
and R
6
each independently represent a hydrogen, an alkyl group having 1 to 6 carbon atoms, or an alkylsilyl group having 3 to 9 carbon atoms; and X represents a tetravalent group other than those represented by Formulae (A3):
PREPREG AND CARBON FIBER-REINFORCED COMPOSITE MATERIAL
申请人:TORAY INDUSTRIES, INC.
公开号:US20150210813A1
公开(公告)日:2015-07-30
A prepreg includes; sizing agent-coated carbon fibers coated with a sizing agent; and a thermosetting resin composition impregnated into the sizing agent-coated carbon fibers. The sizing agent includes an aliphatic epoxy compound (A) and an aromatic compound (B) at least containing an aromatic epoxy compound (B1). The thermosetting resin composition includes a thermosetting resin (D) and a latent hardener (E), and optionally includes an additive (F) other than the thermosetting resin (D) and the latent hardener (E). The (a)/(b) ratio is within a predetermined range where (a) is the height of a component at a binding energy assigned to CHx, C—C, and C═C and (b) is the height of a component at a binding energy assigned to C—O in a C
1s
core spectrum of the surfaces of the sizing agent-coated carbon fibers analyzed by X-ray photoelectron spectroscopy.