Metallocene Compounds Having Appended Lewis Acids and Polymerization Therewith
申请人:ExxonMobil Chemical Patents Inc.
公开号:US20200071349A1
公开(公告)日:2020-03-05
This invention relates to metallocene compounds represented by the formula:
catalyst systems comprising said metallocene compound and an activator or a reaction product of the metallocene compound with the at least one activator, and polymerization processes using such metallocene compounds and activators, where Cp
a
and Cp
b
are optionally-substituted cyclopentadienyl rings; A is bridging group; q is zero or 1; Q is O, O(CR
3
R
4
)
m
, (CR
3
R
4
)
m
O, or (CR
3
R
4
)
m
; m is 0 to 18; Z is (CR
3
R
4
)
2
; LA is a Lewis acid; M is a transition metal; X
1
and X
2
are independently R
5
or OR
5
; R
1
and R
2
are independently selected from optionally-substituted hydrocarbyl groups; R
3
and R
4
are independently selected from the group consisting of H, halogen, and an optionally-substituted hydrocarbyl group; and R
5
is alkyl, aryl, perfluoroalkyl, or perfluoroaryl.
这项发明涉及由以下公式表示的茂金属化合物:
包括所述茂金属化合物和活化剂或所述茂金属化合物与至少一个活化剂的反应产物的催化剂体系,以及使用这种茂金属化合物和活化剂的聚合过程,其中Cp
a
和Cp
b
是可选择取代的环戊二烯基环;A是桥连基;q为零或1;Q为O、O(CR
3
R
4
)
m
、(CR
3
R
4
)
m
O或(CR
3
R
4
)
m
;m为0至18;Z为(CR
3
R
4
)
2
;LA为路易斯酸;M为过渡金属;X
1
和X
2
独立地为R
5
或OR
5
;R
1
和R
2
独立地选自可选择取代的烃基团;R
3
和R
4
独立地选自H、卤素和可选择取代的烃基团的群;R
5
为烷基、芳基、全氟烷基或全氟芳基。
Photo-on-Demand Base-Catalyzed Phosgenation Reactions with Chloroform: Synthesis of Arylcarbonate and Halocarbonate Esters
utilized as solvents and reagents for C1 building blocks in organic synthesis. This study reports a novel photo-on-demand in situ synthesis of carbonate esters with CHCl3 solutions containing a mixture of an aromatic or haloalkyl alcohol having relatively high acidity, and an organicbase. We found that the acid–base interaction of the alcohol and base in the CHCl3 solution plays a key role in enabling the
PROBLEM
To provide an environmentally-friendly method for producing industrially an ester compound.
SOLUTION
The present invention is a method for producing an ester compound which comprises subjecting a carboxylic acid and an alcohol to dehydration-condensation reaction using an involatile acid catalyst and then removing the residual acid catalyst by bringing a weak basic substance into contact with the residual acid catalyst.
The reaction of trihalogenomethyl anions with carbonyl compounds: competitive reactivity comparisons and applications to the synthesis of α-trihalogenomethyl alcohols
作者:Paul J. Atkins、Victor Gold、Wasfy N. Wassef
DOI:10.1039/p29840001247
日期:——
of trihalogenomethylanions towards a series of aldehydes relative to their reactivity towards trinitrobenzene. For 4-substituted benzaldehydes, the reactivities obey a linear ρσ– relationship. The most reactive aldehyde used is only two times less reactive towards CCl3– or CBr3– than hydrogen ions, and it is concluded that, in dimethyl sulphoxide solutions, the reaction between trichloromethyl anions
Triethylamine and ethyldiisopropylamine are oxidized by hexachloroacetone. The vinyldialkylamines are acylated by hexachloroacetone, a discussion of the mechanism is presented.