Indium Trifluoromethanesulfonate as a Mild and Chemoselective Catalyst for the Conversion of Carbonyl Compounds into 1,3-Oxathiolanes
作者:Tsuneo Sato、Kiyoshi Kazahaya、Nao Hamada、Shinya Ito
DOI:10.1055/s-2002-33541
日期:——
An efficient method for the preparation of 1,3-oxathiolanes from aldehydes and ketones with 2-mercaptoethanol in the presence of a catalytic amount of indium trifluoromethanesulfonate is reported.
Entirely Solvent-Free Procedure for the Synthesis of Distillable 1,3-Dithianes Using Lithium Tetrafluoroborate as a Reusable Catalyst
作者:Tsuneo Sato、Kiyoshi Kazahaya、Shinya Tsuji
DOI:10.1055/s-2004-829084
日期:——
Treatment of various types of aldehydes and ketones with 1,3-propanedithiol in the presence of a catalytic amount of lithium tetrafluoroborate at 25 °C under solvent-free conditions followed by direct purification by distillation of the resulting mixture affords the corresponding 1,3-dithianes in good to excellent yields. Chemoselective protection of keto aldehydes is also successfully achieved over the catalyst. The catalyst can be recovered and reused.
Mild and efficient catalytic method for α-trimethylsilyl ketones
作者:Chunrui Sun、Jingwei Li、Silviya Demerzhan、Daesung Lee
DOI:10.3998/ark.5550190.0012.403
日期:——
A mild, efficient and convenient method for the synthesis of α-silyl ketones from corresponding aldehydes and trimethylsilyldiazomethane in the presence of a catalytic amount of indium(III) chloride has been developed.
Oxidative cleavage of alkenes catalyzed by a water/organic soluble manganese porphyrin complex
作者:Shiuh-Tzung Liu、K. Venugopal Reddy、Rung-Yi Lai
DOI:10.1016/j.tet.2006.12.029
日期:2007.2
as four side arms, such that this compound is soluble in both organic and water solutions. Complexation of this porphyrin with manganese metal ions resulted in the formation of MnCl–TPP–(PEO750)4. This complex proved to be an excellent catalyst for the oxidative cleavage of CC bonds, yielding the corresponding carbonyl compounds with sodium periodate as an oxidant. Mechanistic pathway for this cleavage
Carboxylic Acids in Secondary Aerosols from Oxidation of Cyclic Monoterpenes by Ozone
作者:Marianne Glasius、Maria Lahaniati、Aggelos Calogirou、Dario Di Bella、Niels R. Jensen、Jens Hjorth、Dimitrios Kotzias、Bo R. Larsen
DOI:10.1021/es990445r
日期:2000.3.1
Carboxylic acids are highly polar and have lower vapor pressures than their corresponding aldehydes and may thus play an important role in secondary organic aerosol formation processes. The most abundant carboxylic acids were the following: cis-pinic acid AB1 (cis-3-carboxy-2,2-dimethylcyclobutylethanoic acid) fromα- and β-pinene; cis-pinonic acid A3 (cis-3-acetyl-2,2-dimethylcyclobutylethanoic acid)