A General and Efficient Catalyst for Palladium-Catalyzed C−O Coupling Reactions of Aryl Halides with Primary Alcohols
作者:Saravanan Gowrisankar、Alexey G. Sergeev、Pazhamalai Anbarasan、Anke Spannenberg、Helfried Neumann、Matthias Beller
DOI:10.1021/ja103248d
日期:2010.8.25
An efficient procedure for palladium-catalyzedcoupling reactions of (hetero)aryl bromides and chlorides with primary aliphatic alcohols has been developed. Key to the success is the synthesis and exploitation of the novel bulky di-1-adamantyl-substituted bipyrazolylphosphine ligand L6. Reaction of aryl halides including activated, nonactivated, and (hetero)aryl bromides as well as arylchlorides with
Synthesis of 9-Anthryl Ethers from trans-9,10-Dihydro-9,10-dimethoxyanthracene by Acid-Catalyzed Transetherification
作者:Dae Chi、Keun Jang、Hee Shin
DOI:10.1055/s-0028-1088073
日期:2009.5
Ar) to anthracene, anthryl ethers at the C9-position of anthracene were obtained as the major products when trans-9,10-dihydro-9,10-dimethoxyanthracene was reacted (10 minutes at 75 ˚C) with various alcohols. 9-Anthryl ethers with primary, secondary, cyclic alcohols, and polyethylene glycol (PEG) were isolated in 47-73% yields under optimized conditions. It is hoped that the devised method offers a
在对蒽的亲电芳族加成反应(Ad E Ar)的研究中,当反式-9,10-二氢-9,10-二甲氧基蒽反应(10分钟)时,蒽C9位的蒽醚是主要产物。在75℃下)与各种酒精混合。在优化的条件下,以47-73%的收率分离出带有伯,仲,环状醇和聚乙二醇(PEG)的9-蒽醚。希望所设计的方法为通过将反式-9,10-二氢-9,10-二甲氧基蒽与各种醇进行酸催化的反式醚化提供一种新的合成路线来制备蒽醚。 互醚化-蒽醚-反式-9,10-二氢-9,10-二甲氧基蒽
Application of Lanthanoids to Organic Chemistry. Direct Alkoxylation of Anthracene
作者:Takashi Sugiyama
DOI:10.1246/cl.1987.1013
日期:1987.6.5
Direct alkoxylation of anthracene with some lower alcohols and ethyleneglycolmonoalkylethers, or monoacetate were carried out in the presence of cerium(IV)tetrakis(trifluoro acetate), and expected alkoxylated anthracene derivatives were obtained.
The present invention relates to compounds of formula (I) ArCH.sub.2 R.sup.1 (I) or a monomethyl or a monoethyl ether thereof (the compound of formula (I) including these ethers may contain no more than 30 carbon atoms in total); ethers, esters thereof; acid addition salts thereof; wherein Ar is an anthracene or substituted anthracene ring system; R.sup.1 contains not more than eight carbon carbon atoms and is a group ##STR1## wherein m is 0 or 1; R.sup.5 is hydrogen; R.sup.6 and R.sup.7 are the same or different and each is hydrogen or C.sub.1-3 alkyl optionally substituted by hydroxy; R.sup.8 and R.sup.9 are the same or different and each is hydrogen or C.sub.1-3 alkyl; --C--C-- is a five- or six-membered saturated carbocyclic ring; R.sup.10 is hydrogen, methyl or hydroxymethyl; R.sup.11, R.sup.12 and R.sup.13 are the same or different and each is hydrogen or methyl; R.sup.14 is hydrogen, methyl, hydroxy, or hydroxymethyl.
The object of the present invention is to provide a photobase generator capable of efficiently generating amines (tertiary amines and amidine) high in catalytic activity by sensing light with a wavelength of from 350 to 500 nm (especially, from 400 to 500 nm).
The present invention is a photobase generator characterized in being represented by general formula (1) or (2).
Y
+
is a quaternary ammonio group of general formula (3) to (5), and X
−
is a counter anion selected from among a borate anion, a phenolate anion, and a carboxylate anion.