An ether-free, internally coordinated dialkylcalcium(II) complex
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Date
2009
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Abstract
The 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.