提供具有高光稳定性的铕配合物。
以下是用以下公式(A)表示的铕配合物:
{其中,R
A
和R
B
分别独立地是具有3至10个碳原子的环烷基基团,而R
C
是具有3至10个碳原子的环烷基基团或用以下公式(B)表示的苯基团:
(其中,X
A
、X
B
、A
C
、X
D
和X
E
独立地代表氢原子;氟原子;具有1至3个碳原子的烷基基团;具有1至3个碳原子的烷氧基团;具有6至10个碳原子的芳基氧基团;具有1至3个碳原子的氟烷基基团;具有1至3个碳原子的氟烷氧基团;或者可能被氟原子、具有1至3个碳原子的烷基基团、具有1至3个碳原子的烷氧基团、具有1至3个碳原子的氟烷基基团、具有1至3个碳原子的氟烷氧基团、氟苯基团、羟基或氰基取代的苯基团,分别);
R
A
是具有3至10个碳原子的环烷基基团;
R
B
和R
C
是用公式(B)表示的苯基团,但是,排除R
A
为环己基团,且R
B
和R
C
为苯基团的情况;或者
R
A
,R
B
和R
C
独立地表示用以下公式(Ba)表示的邻位取代的苯基团:
(其中,X
E
代表氢原子、具有1至3个碳原子的烷基基团、具有1至3个碳原子的烷氧基团、具有1至3个碳原子的氟烷基基团、具有1至3个碳原子的氟烷氧基团、可能被氟原子取代的萘基团、可能被氟原子取代的吡啶基团,或者用以下公式(C)表示的苯基团:
[其中,Z
A
、Z
C
和Z
E
独立地代表氢原子、氟原子、具有1至3个碳原子的烷基基团、具有1至3个碳原子的烷氧基团、具有1至3个碳原子的氟烷基基团、具有1至3个碳原子的氟烷氧基团、可能被氟原子取代的苯基团、羟基或氰基;Z
B
和Z
D
独立地代表氢原子或氟原子,但排除R
A
,R
B
和R
C
都是苯基团的情况),分别;R
D
代表氢原子、氘原子或氟原子;W
A
和W
B
独立地表示具有1至6个碳原子的烷基基团、具有1至6个碳原子的氟烷基基团、苯基、2-噻吩基团或3-噻吩基团;‘n’表示1至3的整数。
A Lewis Base Nucleofugality Parameter, <i>N</i><sup><i>F</i></sup><sub>B</sub>, and Its Application in an Analysis of MIDA-Boronate Hydrolysis Kinetics
作者:Nicholas P. Taylor、Jorge A. Gonzalez、Gary S. Nichol、Andrés García-Domínguez、Andrew G. Leach、Guy C. Lloyd-Jones
DOI:10.1021/acs.joc.1c02729
日期:2022.1.7
The kinetics of quinuclidine displacement of BH3 from a wide range of Lewis base borane adducts have been measured. Parameterization of these rates has enabled the development of a nucleofugality scale (NFB), shown to quantify and predict the leaving group ability of a range of other Lewis bases. Additivity observed across a number of series R′3–nRnX (X = P, N; R′ = aryl, alkyl) has allowed the formulation
已经测量了从广泛的路易斯碱硼烷加合物中置换 BH 3的奎宁环动力学。这些速率的参数化使得能够开发出离核量表 (NF B ),以量化和预测一系列其他路易斯碱基的离去基团能力。在多个系列 R' 3– n R n X (X = P, N; R' = 芳基, 烷基) 中观察到的可加性允许制定相关的取代基参数 ( n f PB , n f AB ),提供了一种方法计算N F B一系列路易斯碱基的值远远超出了实验得出的值。通过取代基参数n f PB与一系列烷基和芳基 MIDA 硼酸盐在中性条件下的水解速率的相关性,探索了核离性参数的效用。这允许鉴定具有接近反应中心的杂原子的 MIDA 硼酸盐,显示出不寻常的动力学不稳定性或水解稳定性。
Revealing Silylation of C(sp
<sup>2</sup>
)/C(sp
<sup>3</sup>
)–H Bonds in Arylphosphines by Ruthenium Catalysis
作者:Jian Wen、Ben Dong、Jinjun Zhu、Yue Zhao、Zhuangzhi Shi
DOI:10.1002/anie.202003865
日期:2020.6.26
The first aromatic C−H silylation between arylphosphines and hydrosilanes enabled by a ruthenium complex has been developed. The excellent ortho ‐selectivity results from a four‐membered metallacyclic intermediate involving phosphorus chelation. The developed system can be extended to the benzylic C−H silylation of arylphosphines. Diverse silylated arylphosphines are produced, exhibiting broad functional
[EN] PROCESS FOR PREPARING CYCLIC CARBONATES<br/>[FR] PROCÉDÉ DE PRÉPARATION DE CARBONATES CYCLIQUES
申请人:BASF SE
公开号:WO2019034648A1
公开(公告)日:2019-02-21
The present invention relates to a process for preparing cyclic carbonates of formula Ia or Ib or mixtures thereof (Ia) (Ib) comprising the process step: a) reacting a propargylic alcohol of formula II (II) with carbon dioxide in the presence of at least one transition metal catalyst TMC1, which comprises a transition metal selected from metals of groups 10, 11 and 12 of the periodic table of the elements according to IUPAC and at least one bulky ligand.
Rhodium-Catalyzed P<sup>III</sup>
-Directed <i>ortho</i>
-C−H Borylation of Arylphosphines
作者:Jian Wen、Dingyi Wang、Jiasheng Qian、Di Wang、Chendan Zhu、Yue Zhao、Zhuangzhi Shi
DOI:10.1002/anie.201813452
日期:2019.2.11
Transition‐metal‐mediated metalation of an aromatic C−H bond that is adjacent to a tertiary phosphine group in arylphosphines via a four‐membered chelate ring was first discovered in 1968. Herein, we overcome a long‐standing problem with the ortho‐C−H activation of arylphosphines in a catalytic fashion. In particular, we developed a rhodium‐catalyzed ortho‐selective C−Hborylation of various commercially
PROCESS FOR PRODUCING PHENYL-SUBSTITUTED HETEROCYCLIC DERIVATIVE THROUGH COUPLING USING TRANSITION METAL CATALYST
申请人:Komiyama Masato
公开号:US20110313169A1
公开(公告)日:2011-12-22
A process for efficiently producing, through few steps either a xanthine oxidase inhibitor, which is a therapeutic agent for hyperuricemia, or an intermediate therefore. The process is a novel coupling process which comprises subjecting a compound represented by formula (1) to coupling reaction with a compound represented by formula (2) in the presence of a transition metal compound to thereby obtain a compound represented by formula (3).