在无溶剂反应条件下,萘酚和互变异构酚衍生物的羟基已被O-,S-,N-和C中心的亲核试剂取代。产生的产品良率极佳。与其他布朗斯台德酸相比,对甲苯磺酸显示出最佳的催化活性。实验观察表明该反应通过萘酚的酮互变异构体的中间体进行。亲核加成到羰基上,然后除去水,得到所需产物。本方法提供了对取代的萘[2,1- b ]呋喃衍生物的访问。使用N生成的产品以中心为中心的亲核试剂可以进一步转化为重要种类的有机分子,例如苯并咔唑和咪唑衍生物。
Brønsted Acid Catalyzed Functionalization of Aromatic Alcohols through Nucleophilic Substitution of Hydroxyl Group
作者:Abhishek Kumar Mishra、Srijit Biswas
DOI:10.1021/acs.joc.5b02849
日期:2016.3.18
have been substituted by O-, S-, N-, and C-centered nucleophiles under solvent-free reaction conditions. The products are generated in good to excellent yields. para-Toluenesulfonic acid exhibits the best catalytic activity compared to other Brønstedacids. Experimental observations suggest that the reaction proceeds through the intermediacy of the keto tautomer of naphthol. Nucleophilic addition to
在无溶剂反应条件下,萘酚和互变异构酚衍生物的羟基已被O-,S-,N-和C中心的亲核试剂取代。产生的产品良率极佳。与其他布朗斯台德酸相比,对甲苯磺酸显示出最佳的催化活性。实验观察表明该反应通过萘酚的酮互变异构体的中间体进行。亲核加成到羰基上,然后除去水,得到所需产物。本方法提供了对取代的萘[2,1- b ]呋喃衍生物的访问。使用N生成的产品以中心为中心的亲核试剂可以进一步转化为重要种类的有机分子,例如苯并咔唑和咪唑衍生物。
Coal. Kinetics of O-alkylation
作者:Ronald Liotta、Glen Brons
DOI:10.1021/ja00397a025
日期:1981.4
hydroxyl groups in coal were measured. The chemical action of quaternary ammonium hydroxide bases in the presence of alkylating agents was used as the probe. Both Illinois No. 6 bituminous and Rawhide subbituminous coals contain aromatic and aliphatic hydroxyls as well as lesser amounts of carboxylic acids. Illinoiscoal was found to 0-alkylate at a faster rate than Rawhide coal. The reactivities of
Nucleophilic <i>ipso</i>-Substitution of Aryl Methyl Ethers through Aryl C–OMe Bond Cleavage; Access to Functionalized Bisthiophenes
作者:Abhishek Kumar Mishra、Ajay Verma、Srijit Biswas
DOI:10.1021/acs.joc.6b02701
日期:2017.4.7
A metal and solvent free strategy to functionalize aryl methyl ethers through direct nucleophilicsubstitution of aryl C–OMe bond has been described. A wide range of O, S, N, and C-centered uncharged nucleophiles has been successfully employed. Using this protocol, functional derivatives of bisthiophene have been synthesized in a straightforward way. The reactions are highly atom-efficient and generate
Novel substituted naphthalene compounds and liquid crystal compositions containing same
申请人:MITSUI PETROCHEMICAL INDUSTRIES, LTD.
公开号:EP0332409A2
公开(公告)日:1989-09-13
In accordance with the present invention, there are provided substituted naphthalene compounds of formula [I].
wherein R¹ represents alkyl of 1-18 carbon atoms, R² represents alkyl of 1-18 carbon atoms, X is -OCH₂- or -CH₂CH₂-, and n is 0 or 1.
The invention also provides liquid crystal compositions containing a substituted naphthalene compound such as a compound of formula [I].