本文描述了C–N键断裂反应场与Catellani–Lautens反应系统之间交叉研究的案例。使用该策略合成了一系列高度官能化的C4-取代的吲哚。通过筛选胺的烷基,可减少C–N键断裂反应的能垒,并避免了相应的变态反应产物。最后,密度泛函理论计算表明,惰性C–N键活化反应不是协同过程。相反,偶联反应首先生成吲哚季铵盐,然后通过S N 2过程发生C–N键断裂。
Copper-catalyzed three-component redox-neutral ring opening of benzothiazoles with aryl iodides and O-benzoyl hydroxylamines for the synthesis of 1-amino-N-(2-(phenylthio)phenyl)methanimine has been developed. This one-pot reaction undergoes C–S and N–O bond cleavage and new C–S and C–N bond construction. Several control experiments excluded a free radical procedure and also demonstrated the secondary
2,4,6‐Trimethoxypyridine is identified as an efficient ligand for promoting a Pd‐catalyzed ortho‐CHamination of both benzamides and triflyl‐protected benzylamines. This finding provides guidance for the development of ligands that can improve or enable PdII‐catalyzed CH activation reactions directed by weakly coordinating functional groups.
Disclosed are aqueous photosolder resist compositions containing (A) an aqueous solution prepared by neutralizing a resin containing a free-radically polymerizable group and a carboxyl group with a base; (B) an inorganic filler; (C) a photocurable mixture of (c-1) a multifunctional acrylic monomer, (c-2) a compound having a cyclic ether group other than a glycidyl group and (c-3) a photoinitiator; and optionally (D) an aqueous solution prepared by neutralizing a free-radically polymerized substance having an acid value of 130 - 230 mgKOH/mg. The cyclic ether group other than a glycidyl group is an alicyclic epoxy or oxetane group, for example.
Dental filler particles and method for their preparation and use
申请人:DENTSPLY DETREY GmbH
公开号:EP1634562A1
公开(公告)日:2006-03-15
A method for producing dental filler particles, comprising
(a) dispersing a polymerisable composite material comprising
(a1) a polymerisable matrix,
(a2) a solid particulate filler, and
(a3) a polymerisation initiator,
in a liquid medium,
(b) mixing the dispersion to reduce the particle size of the dispersed polymerisable composite material, and
(c) polymerising the polymerisable composite material to obtain dental filler particles.
An efficient catalytic asymmetric dearomatizing amination of 2-naphthols and phenols catalyzed by N,N′-dioxide-copper(I) complex as a chiral catalyst was presented. A variety of optically active β-naphthalenone compounds with a nitrogen-containing quaternary carbon stereocenter were obtained with high yield and enantioselectivity under mild reaction conditions. Mechanistic studies indicated that this