作者:Lindsay A. Batory、Christine E. McInnis、Jon T. Njardarson
DOI:10.1021/ja067073o
日期:2006.12.1
A novel copper-catalyzed vinyl oxirane ring expansion protocol has been developed. A wide range of vinyl oxiranes can be rearranged to 2,5-dihydrofurans in excellent yields in the presence of electrophilic copper(II) acetylacetonate catalysts. Regioisomeric vinyl oxiranes can be converted to a single dihydrofuran product using these conditions. This method uses low catalyst loadings (0.5-5 mol %), has good tolerance of substitution patterns, and can be done in the absence of solvent.
BARBOT, F.;MIGINIAC, PH., SYNTHESIS, BRD, 1983, N 8, 651-654
作者:BARBOT, F.、MIGINIAC, PH.
DOI:——
日期:——
PASTE COMPOSITION, GREEN CERAMIC BODY, AND METHODS FOR MANUFACTURING CERAMIC STRUCTURE
申请人:TAKASE Hiroyuki
公开号:US20080233416A1
公开(公告)日:2008-09-25
A paste composition comprises inorganic particles; and a binder containing a copolymer made by copolymerizing a mixture. The mixture comprises a first (meth)acrylic ester whose homopolymer has a first glass transition temperature Tg[h]; and a second (meth)acrylic ester whose homopolymer has a second glass transition temperature Tg[l] lower than the first glass transition temperature Tg[h]. The total molar fraction of the first and second (meth) acrylic esters in the mixture is 80 mol % or more. The first and the second glass transition temperatures Tg[h] and Tg[L] satisfy the relationships Tg[h]≧100° C. and Tg[h]−Tg[l]≧50° C.