Various carbon-carbon double bonds in olefins and α,β-unsaturatedketones were effectively reduced to the corresponding alkanes and saturated ketones, using ammoniumformate as a hydrogentransfer agent in the presence ofPd/C as catalyst in refluxing methanol.
以甲酸铵为氢转移剂,Pd/C为催化剂,甲醇回流。
Preparation of olefins from alcohols by thermal rearrangement of propargylic xanthates
作者:Mélanie Fauré-Tromeur、Samir Z Zard
DOI:10.1016/s0040-4039(98)02669-0
日期:1999.2
Upon heating in toluene in the presence of a catalytic amount of collidinium trifluorosulfonate salt, various S-propargylic xanthates derived from secondary alcohols can be easily converted to their corresponding olefins in good yields.
19-nor-5β-Methyl-steroide, III. Die Acetolyse von 3-Methoxy-steroiden
作者:Günther Snatzke
DOI:10.1002/jlac.19656860120
日期:1965.7.15
y-Δ4-cholesten (III), 3β.6β-Diacetoxy-Δ4-cholesten (V) und dessen 3α-Epimeres (IVb) identifiziert werden. IV b und V entstehen durch Acetolyse aus dem 3β-Methoxy-Derivat III. Das 6-Monoacetat (VIc) des 5α-Cholestan-3α.5.6β-triols liefert mit SOCl2 ein cyclisches Sulfit VII, das 3-Monoacetat VId das entsprechende 5α.6α-Epoxyd IXb. Die Acetolyse gesättigter und ungesättigter 3β- und 3α-Methoxy-steroide
Copper(II) sulfate adsorbed on silica gel efficientlydehydrated secondary and tertiary alcohols under mild conditions to give olefins. The rate of dehydration of tertiary alcohols is much faster than that of secondary alcohols.
Sulfuric Acid Adsorbed on Silica Gel. A Multipurpose Acid Catalyst
作者:Flavio Chávez、Silvia Suárez、Miguel A. Díaz
DOI:10.1080/00397919408019058
日期:1994.8
ketones to 1,3-dioxolanes and their hydrolysis, α,β-unsaturated ketones to enol ethers, and alcohols to methyl-methoxyethyl ethers are performed efficiently in high yield with sulfuric acid adsorbed on silicagel as catalyst.