Directed regioselectivity in cyclometallated palladium(II) compounds of N-benzylidenebenzylamines. Crystal and molecular structure of [Pd{3,4-(OCH2O)C6H2C(H)NCH2[3,4-(OCH2O)C6H3]-C2,N}(μ-O2CMe)]2
摘要:
The reaction of the Schiff base ligand 3,4-(OCH2O)C6H3C(H)=NCH2[3,4-(OCH2O)C6H3] (a) with Pd(OAc)(2) yields two endocyclic cyclometallated compounds: [Pd{3,4-(OCH2O)C6H2C(H)=NCH2[3,4-(OCH2O)C,H,]-C2,N}(mu -O2CMe)](2) (C2,N-bonded) (1a), and [Pd{3,4-(OCH2O)C6H2C(H)=NCH2[3,4-(OCH2O)C6H3]-C6,N}(mu -O2CMe)](2) (C6,N-bonded) (1b), which may be separated by fractional crystallization. The corresponding cyclopalladated dimers with bridging chloride ligands, 2a, 2b, have been prepared by a metathesis reaction with aqueous sodium chloride. Treatment of the latter compounds with tertiary phosphines in the appropriate molar ratio gave the mono and dinuclear compounds, 3a-8a and 3b-5b, respectively. The structure of compound la has been determined by X-ray diffraction analysis. The molecular configuration is a dimeric form of the anti isomer with the cyclopalladated moieties in an 'open-book' arrangement linked by two acetate bridging ligands. (C) 2001 Elsevier Science Ltd. All rights reserved.
通过在PPh 3配体中引入羟基,开发了一种基于( p -HOC 6 H 4 )PPh 2配体的无助催化剂钯催化体系,用于1,3-丁二烯与CO 2的调聚反应。实现了对掺入 CO 2的二乙烯基 δ-内酯单体的高活性和选择性(TON/TOF:高达 4540/568 h -1;δ-内酯及其异构体的选择性:高达 97%)。验证了配体的酚羟基在获得高活性中的关键作用。间歇反应器中大规模反应的良好性能证明了这种简单的催化系统在提高 CO 2价值方面的潜在用途与大宗化学原料。
DENTAL PHOTOCURABLE COMPOSITION CONTAINING HIGH SOLUBLE PHOTOACID GENERATOR
申请人:Shofu Inc.
公开号:EP3888615A1
公开(公告)日:2021-10-06
[Problem]
To provide a dental photocurable composition which can exhibit excellent mechanical characteristics even after returning from a low temperature to room temperature.
[Solution]
To provide a dental photocurable composition, comprising (A) polymerizable monomer, (B) photosensitizer, (C) photoacid generator and (D) photopolymerization accelerator and the (C) photoacid generator may include only (C-1) iodonium salt-based compound of an anion having log S of -4 or less.
DENTAL PHOTOCURABLE COMPOSITION EXCELLENT IN COLOR TONE SELECTIVITY
申请人:Shofu Inc.
公开号:EP3888616A1
公开(公告)日:2021-10-06
To provide a dental photocurable composition having sufficient mechanical property and being excellent in color tone selectivity because of having a small color difference between before curing and after curing.
[Solution]
To provide a dental photocurable composition, comprising (A) polymerizable monomer, (B) photosensitizer, (C) photoacid generator, (D) photopolymerization accelerator and (E) filler, wherein, the dental photocurable composition comprises (B-1) α-diketone compound as the (B) photosensitizer, and the dental photocurable composition comprises, with respect to 100 parts by mass of the (A) polymerizable monomer, 0.15 parts by mass or less of the (B-1) α-diketone compound, 0.5 parts by mass or more of the (C) photoacid generator, and 100 parts by mass or more of the (E) filler.
DENTAL PHOTOCURABLE COMPOSITION HAVING EXCELLENT STORAGE STABILITY
申请人:Shofu Inc.
公开号:EP4062894A1
公开(公告)日:2022-09-28
To provide a dental photocurable composition having good storage stability of a matrix containing a polymerizable monomer and a polymerization initiator, etc. and excellent mechanical strength of a dental photocurable composition comprising a mixture of the matrix and a filler. The dental photocurable composition of the present invention comprises a matrix containing (A) polymerizable monomer, (B) photosensitizer, (C) photoacid generator and (D) photopolymerization accelerator, and (E) filler, wherein, the dental photocurable composition comprises (A1) polymerizable monomer having an acidic group as the (A) polymerizable monomer, and the dental photocurable composition comprises (D1) tertiary aliphatic amine compound having LogP of 2 or more and pKa of 10 or less as the (D) photopolymerization accelerator.
DENTAL PHOTOCURABLE COMPOSITION EXCELLENT IN OPERABILITY AND STORAGE STABILITY
申请人:Shofu Inc.
公开号:EP4062895A1
公开(公告)日:2022-09-28
[Problem]
To provide a dental photocurable composition which has sufficient mechanical property and whose rheological property is not deactivated even after long-term storage.
[Solution]
The dental photocurable composition of the present invention comprises (A) polymerizable monomer, (B) photosensitizer, (D) photopolymerization accelerator and (E) filler, wherein, the dental photocurable composition comprises (D1) aliphatic tertiary amine compound represented by formula (1) as the (D) photopolymerization accelerator, and the dental photocurable composition comprises (E1) hydrophobized silica fine particle having an average diameter of primary particle of 1 to 40 nm as the (E) filler.
(wherein R1 represents a substituent consisting of three or more carbons having an electron-withdrawing group at α-carbon and/or β-carbon of an amine starting from N, R2 represents a substituent consisting of three or more carbons which may have an electron-withdrawing group, R3 represents a substituent consisting of one or more carbons which may have an electron-withdrawing group, and α-carbon of N in the formula (1) is not an electron-withdrawing group.)
问题
提供一种牙科光固化组合物,该组合物具有足够的机械性能,即使在长期储存后其流变性能也不会失效。
[解决方案]
本发明的牙科光固化组合物包括(A)可聚合单体、(B)光敏剂、(D)光聚合促进剂和(E)填料,其中,牙科光固化组合物包括(D1)由式(1)表示的脂肪族叔胺化合物作为(D)光聚合促进剂,牙科光固化组合物包括(E1)疏水性二氧化硅细颗粒作为(E)填料,该细颗粒的主颗粒平均直径为1至40纳米。
(其中 R1 代表由三个或三个以上的碳组成的取代基,这些碳在从 N 开始的胺的α-碳和/或 β-碳上具有取电子基团;R2 代表由三个或三个以上的碳组成的取代基,这些碳可能具有取电子基团;R3 代表由一个或一个以上的碳组成的取代基,这些碳可能具有取电子基团;式 (1) 中 N 的 α-碳不是取电子基团)。
PHOTOCURABLE COMPOSITION EXCELLENT IN CURING DEPTH
申请人:SHOFU INC.
公开号:US20220287919A1
公开(公告)日:2022-09-15
[Problem]
To provide a photocurable composition having a high curing depth.
[Solution]
To provide a photocurable composition of the present disclosure comprises (A) polymerizable monomer, (B) photosensitizer, (C) photoacid generator, and (D) photopolymerization accelerator, wherein, the photocurable composition comprises (D-1) amine compound represented by formula (1) as the (D) photopolymerization accelerator.
(In the formula (1), R
1
is a substituent represented by formula (2), and R
2
and R
3
are substituents represented by formula (2) or substituents selected from —OH group, —O— group, —S— group, —NH—C(O)—NH— group, —C(O)—O— group, —OC(O)— group, —OC(O)—NH— group, —NH—C(O)—O— group, halogen, an organic group which may have an alkoxysilyl group, an aromatic ring which may have a substituent and an alicyclic heterocycle which may have a substituent. Further, R
2
and R
3
may be H when at least one or more R
4
s of the formula (2) are an aromatic ring, and R
3
may be H when R
2
is a substituent represented by the formula (2).)