- Trimethylsilyl Esters as Novel Dual-Purpose Protecting Reagents
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Trimethylsilyl esters, AcOTMS, BzOTMS, TCAOTMS, etc., are inexpensive and chemically stable reagents that pose a negligible environmental hazard. Such compounds prove to serve as efficient dualpurpose reagents to respectively achieve acylation and trimethylsilylation of alcohols under acidic or basic conditions. Herein, a detailed study on protection of various substrates and new methodological investigations is described.
- Chen, Jyun-Siao,Huang, Po-Hsun,Hsieh, Ya-Chi,Liu, Jen-Wei,Hsu, Hsiao-Lin,Zhang, Kai-Min,Wu, Ren-Tsung,Chang, Ting-Shuo,Liu, Yu-Hao,Wu, Hsin-Ru,Luo, Shun-Yuan
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supporting information
p. 754 - 762
(2021/12/02)
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- Method for Producing Acyloxysilanes, Acyloxysilanes Obtained Thereby, and Use of Same
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An object of the invention is to provide a method for efficiently producing an acyloxysilane which is useful as a functional chemical, an acyloxysilane obtained thereby, and the use thereof. The present invention provides: a method for producing an acyloxysilane, including a reaction step of reacting an alkoxysilane with a carboxylic anhydride in the presence of a catalyst, wherein the alkoxysilane is a specified alkoxysilane represented by General Formula (I), the carboxylic anhydride is a specified carboxylic acid represented by General Formula (IIA) or (IIB), the catalyst is an acid catalyst, and an acyloxysilane obtained in the reaction step is a specified acyloxysilane represented by General Formula (IIIA) or (IIIB); and the use of the acyloxysilane as a surface treatment agent or the like.
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Paragraph 0131
(2018/03/25)
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- One-pot synthesis of transition metal-substituted carboxylic acids
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Transition metal-substituted carboxylic acids, MRCOOH (R = CH2, CH2CH2), are prepared by the reactions of metal anions with trimethylsilyl halocarboxylates, XRCOOSiMe3, followed by treatment with silica gel.The carboxylic acid moiety is readily transforme
- Akita, Munetaka,Kakinuma, Noboru,Moro-oka, Yoshihiko
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- Le sulfate de bis (trimethylsilyle) reactif de sulfonation en chimie organique
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Trimethylsilyl chlorosulphonate 1 and di-(trimethylsilyl) sulphate 2 are obtained by reacting trimethylchlorosilane with chlorosulphonic acid and sulphuric acid respectively. 1 and 2 are thermally stable and soluble in most of the organic solvents.The silyl sulphonates are hydrolyzed at room temperature. 2 is less reactive than 1 and is adequate reagent when the molecule contains ether or ester groups as 1 reacts also as chlorination reagent.Thus, 2 when refluxed in the presence of an excess of methoxy benzene gives quantitatively trimethylsilyl 4-methoxybenzenesulphonate 3 which is hydrolyzed quantitatively into 4-methoxybenzenesulphonic acid. 2 reacts with acid chlorides and acid anhydrides in refluxing cyclohexane or carbon tetrachloride which leads to α-sulphonic carboxylic acids 4 by sulphonation in position α to the acyl function.When starting from chloroacetylchloride, a gem-disulphonic derivative 5 is formed.A common intermediate, acyl and trimethylsilyl sulphate 6, is put forward and easy preparation and isolation of sulphonic acids by this method is pointed out.
- Bourgeois, Paul,Duffaut, Norbert
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p. 195 - 199
(2007/10/02)
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- A FACILE SILYLATION OF CARBOXYLIC ACIDS WITH HEXAMETHYLDISILOXANE
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It was found that, in the presence of a catalytic amount of sulfuric acid, hexamethyldisiloxane silylates carboxylic acids to give trimethylsilyl carboxylates in good yields.
- Matsumoto, Hideyuki,Hoshino, Yoshikazu,Nakabayashi, Jiro,Nakano, Taichi,Nagai, Yoichiro
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p. 1475 - 1478
(2007/10/02)
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