Add time:08/02/2019         Source:sciencedirect.com

Imines of diethyl aminomalonate slowly dimerise imidazolidines in ethanol or methylene chloride at 40°C, but cycloaddition to other imines does not occur. Imines of glycine, alanine and phenylglycine methyl esters undergo rapid regio- and stereo-specific cycloaddition to methyl acrylate (MeCN, 25°C) in the presence of Ag(I) or Mn(II) salts, and triethylamine, whilst Zn(II)-or Co(II) salts dimerise the imines to imidazolidines. In the latter case cycloaddition to other imines also occurs. Use of Mg(II) salts can lead to either pyrrolidines or imidazolidines depending on the salt used. A correlation with metal cation hydration enthalpies is noted. Heating imidazolidines in the presence of dipolarophiles effects a tandem cyclo-reversion-cycloaddition process leading to new cycloadducts.

We also recommend Trading Suppliers and Manufacturers of 1,3-DIMETHYL-2-(2-THIENYL)IMIDAZOLIDINE (cas 104208-13-1). Pls Click Website Link as below: cas 104208-13-1 suppliers