An Ether-Free, Internally Coordinated Dialkylcalcium(II) Complex
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Abstract
The alkylpotassium compound KC{SiMe(3)}(2){SiMe(2)hpp} (hppH = 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine) reacts with a slurry of CaI(2) in toluene to give the internally coordinated dialkylcalcium(II) complex Ca(C{SiMe(3)}(2){SiMe(2)hpp})(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 (1)H and (13)C NMR spectra suggest that the metallacycle is transiently opened in toluene at room temperature.