The present invention provides a base generator having the structure of formula (1):
wherein R
1
, R
2
, R
3
, R
4
, R
5
, and Y
circle around (−)}
are defined as in the specification. The base generator of the present invention can be used for imidization of a polyimide precursor, promoting crosslinking of epoxy monomers, or crosslinking of polyurethane or polyurea.
本发明提供了一种具有公式(1)结构的碱发生器:
其中R1、R2、R3、R4、R5和Ycircle around (−)}如说明书中所定义。本发明的碱发生器可用于聚酰亚胺前体的酰亚胺化,促进环氧单体交联,或聚氨酯或聚脲的交联。
Scalable Electrochemical Dehydrogenative Lactonization of C(sp<sup>2</sup>/sp<sup>3</sup>)–H Bonds
A practical, electrochemical method is developed for the direct dehydrogenative lactonization of C(sp2/sp3)–H bonds under external oxidant- and metal-free conditions, delivering diverse lactones, including coumarin derivatives with excellent regioselectivity. The scalable nature of this newly developed electrochemical process was demonstrated on a 40 g scale following an operationally simple protocol
func(tionalization): An efficient and practical protocol for the CH ortho arylation of benzoicacids with diaryliodonium salts by using water as an environmentally benign, nontoxic reaction medium is developed. The choice of water as the solvent is crucial for this reaction, which sets the stage for the broad application of aqueous conditions in CH functionalization reactions.
Palladium-Catalyzed Decarboxylative Annulation of 2-Arylbenzoic Acids with [60]Fullerene via C–H Bond Activation
作者:Dian-Bing Zhou、Guan-Wu Wang
DOI:10.1021/acs.orglett.5b00243
日期:2015.3.6
A convenient and highly efficient palladium-catalyzeddecarboxylative annulation of 2-arylbenzoic acids with [60]fullerene has been exploited to synthesize the novel and scarce [60]fullerene-fused dihydrophenanthrenes. The use of Lewis acid ZnCl2 is crucial for the success of the present formal [4 + 2] annulation reaction. Plausible reaction pathways leading to the observed products have been proposed
Condition Optimization for Synthesis of 5-methyl-2(pyrimidin-2-yl) Benzoic Acid
作者:Fei Liu、Shengyong Zhao、Linpo Yu、Haibiao Liu
DOI:10.2174/1570178617999200517130625
日期:2021.7
2-bromo-5-methyl benzoic acid and 2-chloropyrimidine as raw materials, PdCl2(PPh3)2 is used as a metalcatalyst to mediate one-pot generation of 5-methyl-2-(pyrimidin-2-yl)benzoic acid using the Negishi cross-coupling method. Theoptimum condition involves 2-bromo-5-methylbenzoic acid (10.00 g) and anhydrous zinc chloride powder (6.32 g) together with thecatalyst: 2-bromo-5-methylbenzoic acid molar ratio of 0.02