Negative resist composition and resist pattern forming process
申请人:SHIN-ETSU CHEMICAL CO., LTD.
公开号:US10120279B2
公开(公告)日:2018-11-06
A negative resist composition comprising (A) a sulfonium compound of betaine type and (B) a polymer is provided. The resist composition is effective for controlling acid diffusion during the exposure step, exhibits a very high resolution during pattern formation, and forms a pattern with minimal LER.
A new protocol for the deoxygenation of alcohols and the hydrogenation of alkenes under Brønsted acid catalysis has been developed. The method is based on the use of either a benzyl or isopropyl ether as a tracelesshydrogen‐atom donor, and involves an intramolecular hydride transfer as a key step, which is achieved in a regio‐ and stereoselective manner.
Efficient Synthesis of Dimeric Oxazoles, Piperidines and Tetrahydroisoquinolines from <i>N</i>
-Substituted 2-Oxazolones
作者:Yun He、Piyush K. Agarwal、I. N. Chaithanya Kiran、Ruocheng Yu、Bei Cao、Cheng Zou、Xinghua Zhou、Huacheng Xu、Biao Xu、Lei Zhu、Yu Lan、K. C. Nicolaou
DOI:10.1002/chem.201601471
日期:2016.6.1
practical method for the construction of heterocycles from N‐substituted 2‐oxazolonesthrough cascade, BF3⋅Et2O/H2O‐catalyzed reactions involving iminium ion generation and trapping by external or internal olefinic and aryl moieties is described. Mechanistic and computational studies revealed the strong protic acid HBF4 as the initiating catalyst for these cascade reactions. Providing access to novel molecular
为杂环的来自建筑的温和和实用的方法Ñ通过级联取代-2-恶唑酮,BF 3 ⋅Et 2 ø/ H 2涉及亚胺离子产生和由外部或内部烯属的和芳基部分捕获O形催化的反应进行说明。机理和计算研究表明,强质子酸HBF 4是这些级联反应的引发催化剂。这些过程提供了获得新颖分子多样性的途径,可以促进化学生物学研究,药物发现工作和天然产物合成。
Base-Promoted C–C Bond Activation Enables Radical Allylation with Homoallylic Alcohols
作者:Maximilian Lübbesmeyer、Emily G. Mackay、Mark A. R. Raycroft、Jonas Elfert、Derek A. Pratt、Armido Studer
DOI:10.1021/jacs.9b12343
日期:2020.2.5
C-radical addition to the double bond of the title reagents and subsequent base-promoted homolytic Cα–Cβ cleavage leads to the formation of the corresponding allylated products along with ketyl radicals that act as single electron reductants to sustain the chain reactions. Substrate scope is documented and the role of base in the C–Cbond activation is studied by computation.
Chelate control in the rhodium-catalysed homogeneous hydrogenation of chiral allylic and homoallylic alcohols
作者:John M. Brown、Ramachandra G. Naik
DOI:10.1039/c39820000348
日期:——
Chelate bisphosphine rhodium complexes afford a high degree of stereoselection in the homogeneoushydrogenation of 3-phenylbut-3-en-2-ol and 4-phenylpent-4-en-2-ol in opposite senses.