共查询到20条相似文献,搜索用时 15 毫秒
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Hamid Reza Shaterian Nafiseh Fahimi Kobra Azizi 《Phosphorus, sulfur, and silicon and the related elements》2013,188(7):1604-1611
Abstract An eco-friendly and mild protocol for trimethylsilyl protection of alcohols over phosphorus pentoxide supported on silica gel using hexamethyldisilazane has been described. Solvent-free and ambient reaction conditions, easy workup, short reaction times, excellent yields, and reusability of the catalyst are the noticeable features of this methodology. GRAPHICAL ABSTRACT 相似文献
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Maasoumeh Jafarpour Abdolreza Rezaeifard Mahdieh Heidari 《Phosphorus, sulfur, and silicon and the related elements》2013,188(7):1470-1482
Abstract Operationally simple and environmentally benign methods for some organic transformations comprising reductive coupling of sulfonyl chlorides, chemoselective deoxygenation of sulfoxides, and halogenation of alcohols mediated by ZrOCl2·8H2O/MX in water have been developed. GRAPHICAL ABSTRACT 相似文献
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Behzad Zeynizadeh Mohammad Mehdi Baradarani Ronak Eisavi 《Phosphorus, sulfur, and silicon and the related elements》2013,188(11):2208-2215
Abstract Solvent-free conversion of various epoxides to the corresponding thiiranes was carried out efficiently with immobilized thiourea on CaCO3. The reactions were completed within 1–12 min under oil bath (60 °C–70 °C) conditions to afford thiiranes in 88%–98% yields. [Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental resource: Figures S1–S3.] GRAPHICAL ABSTRACT 相似文献
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Mohanbabu Maradolla G. V. P. Chandramouli 《Phosphorus, sulfur, and silicon and the related elements》2013,188(8):1650-1654
Abstract A simple and environmentally benign synthesis of 2-amino-1,3-selenazoles by microwave irradiation using 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) ionic liquid (IL) is described. Acyl halides, phenacyl halides, and α-bromo-β-keto esters easily undergo condensation with selenourea in ([Bmim]BF4) by microwave irradiation to afford the desired products of good purity in excellent yields. The ionic liquid can be easily recovered and reused at least 10 times without losing its activity. The duration of the reaction ranges from 4–6 min. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file. GRAPHICAL ABSTRACT 相似文献
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Liqiang Wu Shujun Chao Xiao Wang Fulin Yan 《Phosphorus, sulfur, and silicon and the related elements》2013,188(2):304-310
Abstract Thiocyanation of aromatic ethers, anilines, and indoles have been achieved using ammonium thiocyanate in the presence of poly[4-diacetoxyiodo] styrene (PDAIS) in CH3CN at room temperature. GRAPHICAL ABSTRACT 相似文献
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Liqiang Wu Pengli Sun Fulin Yan 《Phosphorus, sulfur, and silicon and the related elements》2013,188(10):2055-2060
Abstract A highly convenient method for the trimethylsilylation of alcohols and phenols via treatment by hexamethyldisilazane in the presence of melamine trisulfonic acid as a catalyst has been developed. A wide variety of hydroxyl groups were selectively protected under solvent-free conditions. GRAPHICAL ABSTRACT 相似文献
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Dariusz Cal Piotr Zagórski 《Phosphorus, sulfur, and silicon and the related elements》2013,188(12):2295-2302
Abstract New trifluoromethyl-functionalized 2-phosphonopyrroles were obtained by 5-exotrig cyclization of trifluoromethyl and phosphonyl functionalized enaminoketones. GRAPHICAL ABSTRACT 相似文献
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Qing Liu Yinfeng Han 《Phosphorus, sulfur, and silicon and the related elements》2013,188(10):2033-2037
Abstract Sodium silicate pentahydrate has been utilized as an efficient catalyst for the Knoevenagel condensation of aromatic aldehydes with active methylene compounds to afford substituted olefins in yields of 80.6%~98.9% under solvent-free conditions at room temperature within a short time. The advantages of this procedure are mild reaction conditions, excellent yields, cleaner reaction profiles, and operational simplicity. GRAPHICAL ABSTRACT 相似文献
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Edward E. Nifantyev Elena N. Rasadkina Pavel V. Slitikov 《Phosphorus, sulfur, and silicon and the related elements》2013,188(9):1981-1987
Abstract The phosphorylation of acylated trihydroxybenzene derivatives by amides of phosphorous acid was considered. The possibility of selective phosphorylation of triacetoxy phloroglucin was shown. GRAPHICAL ABSTRACT 相似文献
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Abdel-Aziz S. El-Ahl Fatty A. Amer Akram H. Elbeheery 《Phosphorus, sulfur, and silicon and the related elements》2013,188(11):2226-2235
Abstract Unprecedented high-yield simple and mild conversion of primary aliphatic and aromatic thioamides into 5-substituted tetrazoles on treatment with a combination of tetrachlorosilane and sodium azide in refluxing acetonitrile has been achieved. Secondary acyclic, cyclic, and heterocyclic thioamides could also be transformed in high yields into 1-substituted, 1,5-disubstituted, or annulated tetrazoles under the same reaction condition. GRAPHICAL ABSTRACT 相似文献
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Arash Ghorbani-Choghamarani Mohammad Soleiman-Beigi Farid Noormohammadi 《Phosphorus, sulfur, and silicon and the related elements》2013,188(8):1665-1672
Abstract Trimethylphenylammonium tribromide has been introduced as a versatile and new oxidizing agent for the preparation of disulfides and sulfoxides from thiols and sulfides, respectively. The reaction progress is simple, and proceeds under mild and homogenous conditions in ambient temperature. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file. GRAPHICAL ABSTRACT 相似文献