共查询到20条相似文献,搜索用时 0 毫秒
1.
Arash Ghorbani‐Choghamarani Mohammad Ali Zolfigol Maryam Hajjami Shila Jafari 《中国化学会会志》2008,55(6):1208-1213
Tribromomelamine (TBM) can be used as a novel catalyst for the trimethylsilylation of alcohols and phenols with 1,1,1,3,3,3‐hexamethyldisilazane (HMDS). A wide variety of hydroxyl groups were selectively protected in CH2Cl2/CH3CN under mild conditions. 相似文献
2.
Babasaheb P. Bandgar Suhas P. Kasture 《Monatshefte für Chemie / Chemical Monthly》2001,132(9):1101-1104
Summary. Trimethylsilylation of alcohols and phenols is carried out using hexamethyldisilazane and LiClO4 under microwave irradiation and neutral conditions. The deprotection of silyl ethers is carried out similarly using natural
kaolinitic clay and a few drops of water.
Received March 1, 2001. Accepted (revised) April 17, 2001 相似文献
3.
Farhad Shirini Mohammad Ali Zolfigol Masoumeh Abedini 《Monatshefte für Chemie / Chemical Monthly》2009,140(1):61-64
Abstract Saccharin sulfonic acid was easily prepared by the reaction of saccharin with neat chlorosulfonic acid at room temperature.
This reagent is efficiently able to catalyze the chemoselective trimethylsilylation of alcohols with hexamethyldisilazane
in the presence of amines and thiols.
Graphical abstract
相似文献
4.
An easy method for the preparation of trimethylsilyl ethers from alcohols and 1,1,1,3,3,3‐hexamethyl‐disilazane (HMDS) using silica sulfate as a catalyst under mild conditions in excellent yields is described. 相似文献
5.
Summary. Poly(ethylene glycol) was used as the solvent for selective deprotection of 1,1-diacetates (acylals) with easy recyclability of solvent and sodium hydrogen sulfate catalyst. This method is high yielding, fast, clean, safe, and therefore very suitable for practical organic synthesis. 相似文献
6.
Mahmood Tajbakhsh Majid. M. Heravi Setareh Habibzadeh 《Phosphorus, sulfur, and silicon and the related elements》2013,188(2):361-364
Primary and secondary trimethylsilyl ethers are efficiently and rapidly converted to their corresponding carbonyl compounds with supported potassium ferrate under microwave irradiation in solventless system. 相似文献
7.
Structurally diverse alcohols and phenols were trimethylsilylated in a clean and efficient reaction with hexamethyldisilazane (HMDS) based on the use of I2 generated in situ from Fe(NO3)3?9 H2O/NaI. The reaction occurs very rapid in good‐to‐high yield in CH2Cl2 at room temperature, and the use of toxic and corrosive molecular I2 is avoided. 相似文献
8.
Farhad Shirini Mohammad A. Zolfigol Abdol-Reza Abri 《Monatshefte für Chemie / Chemical Monthly》2008,139(1):17-20
Summary. Alcohols and phenols are efficiently converted to their corresponding trimethylsilyl ethers with hexamethyldisilazane (HMDS) in the presence of Fe(HSO4)3 in solution and under solvent-free conditions. 相似文献
9.
The ethylenebis(N‐methylimidazolium) chlorochromate was prepared by addition of N‐methylimidazole to 1,2‐dibromoethane to form the corresponding dibromide salt and subsequent treatment of this salt with CrO3 in 6N HCl solution. It is a stable yellow‐orange solid which selectively oxidized benzylic and allylic alcohols, hydroquinones and trimethylsilyl ethers in refluxing acetonitrile. Oxidation of alcohols was also examined under solvent‐free conditions and showed much better yields of the corresponding carbonyls in a very short reaction time when compared with the conventional method. 相似文献
10.
A. R. Hajipour S. E. Mallakpour I. Mohammadpoor-baltork H. Adibi 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1):155-163
Abstract Benzyltriphenylphosphonium peroxomonosulfate (BnPh3P+HSO5 ?) (1) is used as a new reagent for oxidative deprotection of trimethylsilyl and tetrahydropyranyl ethers and ethylene acetals to afford carbonyl compounds in refluxing acetonitrile in the presence of bismuth chloride. 相似文献
11.
1,3‐Dibromo‐5,5‐dimethylhydantoin (DBDMH) is found to be an effective catalyst for trimethylsilylation various alcohols and phenols with hexamethyldisilazane (HMDS) in dichloromethane at room temperature. 相似文献
12.
Jun Tang Jingxi He Prof. Dr. Sheng-Yin Zhao Prof. Dr. Weiping Liu 《Angewandte Chemie (International ed. in English)》2023,62(17):e202215882
Herein, we report a manganese-catalyzed three-component coupling of secondary alcohols, primary alcohols and methanol for the synthesis of β,β-methylated/alkylated secondary alcohols. Using our method, a series of 1-arylethanol, benzyl alcohol derivatives, and methanol undergo sequential coupling efficiently to construct assembled alcohols with high chemoselectivity in moderate to good yields. Mechanistic studies suggest that the reaction proceeds via methylation of a benzylated secondary alcohol intermediate to generate the final product. 相似文献
13.
Biswanath Das Maddeboina Krishnaiah Vtukuri Saidi Reddy Keetha Laxminarayana 《Helvetica chimica acta》2007,90(11):2163-2166
Treatment of different types of alcohols with tetrahydrofuran (THF) in the presence of VCl3 and CCl4 smoothly afforded the corresponding THF‐based acetals in excellent yields. The reaction is fast at room temperature, and several functional groups are tolerated, with no racemization being observed. A radical mechanism, based on Cl3C. as the active species, is proposed for this novel kind of transformation, which complements the classical tetrahydro‐2H‐pyran‐2‐yl (THP) protocol. 相似文献
14.
Arash Ghorbani‐Choghamarani Kamal Amani Mohammad Ali Zolfigol Maryam Hajjami Roia Ayazi‐Nasrabadi 《中国化学会会志》2009,56(2):255-260
A highly convenient method for the trimethylsilylation of alcohols and phenols via treatment by hexamethyldisilazane in the presence of 1,3–dichloro‐5,5–dimethylhydantoin (DCH) and/or trichloromelamine (TCM) as a catalyst has been developed. A wide variety of hydroxyl groups were selectively protected in CH2Cl2/CH3CN under mild conditions. 相似文献
15.
KBr acts as an efficient and reusable catalyst for the selective and efficient trimethylsilylation of benzylic, primary and secondary aliphatic alcohols and phenols with hexamethyldisilazane. All reactions were performed at room temperature under mild and completely heterogeneous conditions in good to high yields. 相似文献
16.
Majid M. Heravi Masoumeh Haghighi Fatemeh Derikvand Fatemeh F. Bamoharram 《合成通讯》2013,43(21):3103-3107
A simple and effective method for tetrahydropyranylation of alcohols and phenols and the regeneration of THP ethers using a catalytic amount of H14[NaP5W30O110] is reported. 相似文献
17.
Melamine trisulfonic acid, which is easily prepared by the reaction of melamine with neat chlorosulfonic acid, is able to efficiently catalyze the chemoselective methoxymethylation of alcohols with dimethoxymethane (DMM). All reactions were performed under mild and completely heterogeneous reaction conditions in good to high yields. 相似文献
18.
MohammadAli Zolfigol Ardeshir Khazaei Eskandar Kolvari Nadiya Koukabi Hamid Soltani Maryam Behjunia 《Helvetica chimica acta》2010,93(3):587-594
A simple method for the in situ generation of iodine using H5IO6/KI has been developed, and its application in silylation of OH group and iodination of aromatic amines is described. 相似文献
19.
Lotfi Shiri Arash Ghorbani-Choghamarani 《Phosphorus, sulfur, and silicon and the related elements》2013,188(2):492-498
A simple, efficient, and chemoselective oxidation of benzylic alcohols to the corresponding aldehydes and ketones and also hydroquinones to the benzoquinones using bis-(2,4,6-trimethylpyridinium) dichromate (BTMPDC) in acetonitrile is described. A good range of primary and secondary benzylic alcohols and a limited range of hydroquinones were selectively oxidized under reflux conditions in reasonable yields. 相似文献
20.
Farhad Shirini Mohammad Ali Zolfigol Kamal Mohammadi 《Phosphorus, sulfur, and silicon and the related elements》2013,188(7):1567-1570
Reaction of alcohols with hexamethyldisilazane in the presence of silica chloride provides efficiently the corresponding trimethylsilyl ethers. This system discriminates absolutely amines and thiols from alcohols. 相似文献