Polymer-supported gadolinium triflate as a convenient and efficient Lewis acid catalyst for acetylation of alcohols and phenols
作者:Hyo-Jin Yoon、Sang-Myung Lee、Jong-Ho Kim、Hong-Jun Cho、Jung-Woo Choi、Sang-Hyeup Lee、Yoon-Sik Lee
DOI:10.1016/j.tetlet.2008.03.005
日期:2008.5
(CMPS-IM-Gd) catalyst was prepared from chloromethyl polystyrene (CMPS) resin using a simple and convenient procedure. This polymeric catalyst was used as an efficient Lewisacidcatalyst for the acetylation of various alcohols and phenols with acetic anhydride, affording high yields under mild conditions. The reaction was completed in a short period of time with small amounts of the catalyst. The catalyst
The palladium‐catalyzed C−H oxidation of simple arenes is an attractive strategy to obtain phenols, which have many applications in the fine chemicals industry. Although some advances have been made in this research area, low reactivity and selectivity are, in general, observed. This report describes a new catalytic system for the efficient C−H acetoxylation of simple arenes based on Pd(OAc)2 and a
The synthesis and transition temperatures of ester derivatives of 2-fluoro-4-hydroxy- and 3-fluoro-4-hydroxybenzonitriles also incorporating aliphatic ring systems
作者:Stephen M. Kelly、Hanspeter Schad
DOI:10.1002/hlca.19840670624
日期:1984.9.26
The synthesis and liquid-crystaltransitiontemperatures of forty ester derivatives of 2-fluoro-4-hydroxybenzonitrile and 3-fluoro-4-hydroxybenzonitrile are reported. The esters contain the trans-1,4-disubstituted cyclohexane or the 1,4-disubstituted bicyclo[2.2.2]octane rings (some contain an additional phenyl ring). Many of the novel F-substituted esters exhibit substantially higher nematic-isotropic
A wide range of directing groups (ester, ketone, acetate, aryl sulfonate, triazene, carbamate) allow the regioselective directed ortho insertion (DoI) of zinc in the presence of LiCl leading to polyfunctional aryl and heteroaryl zinc reagents.
A method of killing or controlling insect, mite or nematode pests which method comprises applying to the pest or to the locus thereof an effective amount of a compound of formula (I):
wherein R is hydrogen or C1-4 alkyl; and X, Y and Z are independently selected from hydrogen, halogen, or OR¹ where R¹ is optionally substituted aryl or heteroaryl group.
Certain of the compounds of formula (I) are novel and these form a further aspect of the invention
一种杀灭或控制昆虫、螨虫或线虫害虫的方法,该方法包括向害虫或害虫所在地施用有效量的式(I)化合物:
其中 R 是氢或 C1-4 烷基;X、Y 和 Z 独立选自氢、卤素或 OR¹,其中 R¹ 是任选取代的芳基或杂芳基。
某些式(I)化合物是新颖的,它们构成了本发明的另一个方面