C. Eaborn et al., THE FIRST STRUCTURALLY CHARACTERIZED SOLVENT-FREE SIGMA-BONDED DIORGANOCALCIUM, CA[C(SIME3)(3)](2), Chemical communications, (20), 1997, pp. 1961-1962
The monomeric solvent-free compound CaR2 1 [R = C(SiMe3)(3)] is obtain
ed as colourless air-and moisture-sensitive crystals from the reaction
between KR and CaI2; in the solid the C-Ca-C axis is bent with Ca-C 2
.459(9) Angstrom and C-Ca-C 149.7(6)degrees; reactions of 1 with ether
s ROEt give RH, ethene and Ca(OEt)(2).