Coles M.P.Sözerli S.E.Smith J.D.Hitchcock P.B.Day I.J.2025-04-102025-04-102009http://hdl.handle.net/20.500.14701/51641The alkylpotassium compound KCfSiMe 3} 2{SiMe 2hpp} (hppH = l,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine) reacts with a slurry of Cal 2 in toluene to give the internallycoordinated dialkylcalcium(II) complex Ca( C{SiMe 3} 2{SiMe 2hpp] ) 2. The molecular structure in the solid state shows short Ca - N and long Ca - C bonds and a wide C - Ca - C angle. The H and 13C NMR spectra suggest that the metallacycle is transiently opened in toluene at room temperature. © 2009 American Chemical Society.Article10.1021/om8011618