申请人:Board of Regents of the University of Nebraska
公开号:US05211889A1
公开(公告)日:1993-05-18
A soluble highly reactive form of calcium, prepared from Ca(II) salts and a reducing agent in ethereal, polyethereal, or hydrocarbon solvents, is presented. This form of calcium can be used in the preparation of organocalcium reagents. The organocalcium reagents resulting from the reaction of the soluble highly reactive calcium with organic compounds containing either halide, cyanide, a 1,3-diene, or a polyunsaturated functionality, are stable, useful reagents for organic synthesis. The organocalcium halide reagents undergo Grignard-type reactions. They also undergo reactions with Cu(I) salts to form organocalcium cuprate reagents. The organocalcium cuprate reagents undergo a variety of cross-coupling reactions. The soluble highly reactive calcium reacts with 1,3-dienes to yield the corresponding 2-butene-1,4-diylcalcium complexes. These bis-organocalcium reagents can undergo dialkylation reactions with .alpha.,.omega.-alkylene dihalides and dichlorosilanes to form the corresponding 3-, 5-, and 6-membered ring derivatives. The soluble highly reactive calcium also reacts with organic dihalides to form mono- or diorganocalcium compounds which can be converted into a wide variety of polymers.
一种可溶性、高反应性的钙形式,由Ca(II)盐和还原剂在乙醚、聚醚或烃类溶剂中制备而成。这种钙形式可用于制备有机钙试剂。由可溶性高反应性钙与含卤素、氰基、1,3-二烯或多不饱和官能团的有机化合物反应而产生的有机钙试剂是稳定的、有用的有机合成试剂。有机钙卤化物试剂经历格氏试剂型反应。它们还与Cu(I)盐发生反应形成有机钙铜酸盐试剂。有机钙铜酸盐试剂经历各种交叉偶联反应。可溶性高反应性钙与1,3-二烯反应生成相应的2-丁烯-1,4-二基钙配合物。这些双有机钙试剂可与α,ω-烯烃二卤化物和二氯硅烷发生二烷基化反应,形成相应的3、5和6元环衍生物。可溶性高反应性钙还与有机二卤化物反应形成单或双有机钙化合物,可转化为各种聚合物。