Mischmetall, an alloy of the light lanthanides, has been used in a variety of organicreactions, either as a coreductant in samarium(II)-mediated reactions (Barbier and Grignard-type reactions, pinacoliccouplingreactions) or as the promoter of Reformatsky-type reactions. It has been also employed as the starting material for easy syntheses of lanthanide trihalides, the reactivity of which has been
Alkylative Reduction of Titanium(IV) Isopropoxide with EtMgBr: Convenient Method for the Generation of Subvalent Titanium Alkoxide Reagents and their Reactivity in Pinacol Coupling Reactions
作者:Oleg G. Kulinkovich、Evgenii A. Matiushenkov、Nikolai A. Sokolov
DOI:10.1055/s-2003-43370
日期:——
products from the reaction of Ti(IV) isopropoxide with ethylmagnesium bromide in diethyl ether evidences the formation of subvalent titaniumisopropoxide species in various oxidation states depending on relative amounts of the reactants. Reaction of titanium(IV) isopropoxide with one equivalent of the Grignard reagent gives presumably titanium(III) isopropoxide. The latter is generated as a result
An electrophotographic toner comprises a polyester made from a diol and a dicarboxylic acid, further comprising (a) a diol and (b) a diol and (d) a tribasic or higher carboxylic acid and at least one charge controller. It may further comprise (e) a diol. (a), (b) and (e) are defined by the formulae.
Criegee et al., Justus Liebigs Annalen der Chemie, 1956, vol. 599, p. 81,93
作者:Criegee et al.
DOI:——
日期:——
A simple synthesis of symmetrical α-diones from organometallic reagents and 1,4-dimethyl-piperazine-2,3-dione
作者:Ulrich T. Mueller-Westerhoff、Ming Zhou
DOI:10.1016/s0040-4039(00)61622-2
日期:1993.1
Short reflux of an equimolar mixture of N,N'-dimethyl ethylenediamine and diethyl oxalate in i-propanol or diethyl ether leads to 1,4-dimethyl-piperazine-2,3-dione, which is able to react with two equivalents of organolithium or Grignard compounds to form symmetrically substituted alpha-diones in excellent yields.