- Room-temperature bismuth-catalyzed bis-arylation of carbonyl compounds with aryl ethers and phenols
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Using Bi2(SO4)3 as the catalyst and TMSCl as the additive, a wide variety of aldehydes, ketones, and acetals were smoothly condensed with aryl ethers at room temperature to provide the corresponding diarylmethanes and triarylmethanes selectively in good to excellent yields. Using Bi2(SO4)3 as the catalyst and TMSCl as the additive, a wide variety of aldehydes, ketones, and acetals were smoothly condensed with aryl ethers at room temperature to selectively provide the corresponding diarylmethanes and triarylmethanes in good to excellent yields. Copyright
- Liu, Congrong,Li, Manbo
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p. 1274 - 1278
(2013/11/06)
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- Sodium bisulfite: An efficient catalyst for ether formation via dehydration of aromatic/aliphatic alcohol
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Straightforward etherification of benzyl alcohols (1) via intermolecular dehydration can be efficiently catalyzed by sodium bisulfite under solvent-free conditions. In the presence of 0.3 mol% or 0.6 mol% amount of sodium bisulfite, symmetric and unsymmetric ethers are prepared from the corresponding alcohols in high yields (up to 95%). Etherification of benzhydryl alcohols is also discussed. Copyright
- Wang, Hui,Zhu, Xingfei,Lu, Yangning,Li, Yue,Gao, Xiang
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p. 1180 - 1184
(2012/04/23)
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- EWG assisted nucleophilic fluorination using PPHF: A strategy for the synthesis of 1,2,2-triaryl-2-fluoroethanones
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The nucleophilic fluorination of 1,2,2-triaryl-2-hydroxyethanones by fluoride ion has been carried out using pyridinium poly(hydrogen fluoride) (PPHF) to give 1,2,2-triaryl-2-fluoroethanones in fairly good yield. The presence of electron withdrawing group
- Kumar, Anil,Pal, Anil K.,Anand, Rishi D.,Singh, Tej V.,Venugopalan, Paloth
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experimental part
p. 8308 - 8313
(2011/11/12)
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- Three-component synthesis of amine derivatives using benzylic and allylic alcohols as N-alkylating agents in the absence of external catalysts and additives
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The direct employment of benzylic and allylic alcohols as N-alkylating agents provides a useful synthetic route for amine derivatives by avoiding the preactivation of the hydroxy groups of alcohols. Herein we report a novel by-product-catalyzed three-comp
- Li, Hai-Hua,Dong, De-Jun,Tian, Shi-Kai
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supporting information; experimental part
p. 3623 - 3626
(2009/05/07)
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- Organic reactions catalyzed by methylrhenium trioxide: Dehydration, amination, and disproportionation of alcohols
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Methylrhenium trioxide (MTO) is the first transition metal complex in trace quantity to catalyze the direct formation of ethers from alcohols. The reactions are independent of the solvents used: benzene, toluene, dichloromethane, chloroform, acetone, and in the alcohols themselves. Aromatic alcohols gave better yields than aliphatic. Reactions between two different alcohols could also be used to prepare unsymmetric ethers, the best yields being obtained when one of the alcohols is aromatic. MTO also catalyzes the dehydration of alcohols to form olefins at room temperature, aromatic alcohols proceeding in better yield. When primary (secondary) amines were used as the limiting reagent, direct amination of alcohols catalyzed by MTO gave good yields of the expected secondary (tertiary) amines at room temperature. Disproportionation of alcohols to alkanes and carbonyl compounds was also observed for aromatic alcohols in the presence of MTO. On the basis of the results of this investigation and a comparison with the interaction between MTO and water, a concerted process and a mechanism involving carbocation intermediates have been suggested.
- Zhu, Zuolin,Espenson, James H.
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p. 324 - 328
(2007/10/03)
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- Evidence for rate limiting C-H bond cleavage in the leuckart reaction
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A rho value of +0.21 is reported for the reaction of mono 4-substi- tuted benzophenones with formamide. This, in conjunction with a kinetic iso- tope effect value of 1.80 obtained for the system, suggests a rate-limiting C-H bond cleavage.
- Awachie, Peter I.,Agwada, Vincent C.
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p. 1899 - 1910
(2007/10/02)
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