M. Rieckhoff et al., ANSA-METALLOCENES OF CALCIUM AND STRONTIUM - ONE-POT SYNTHESIS OF ORGANOMETALLIC COMPLEXES OF THE HEAVIER ALKALINE-EARTH METALS, Angewandte Chemie, International Edition in English, 32(7), 1993, pp. 1079-1081
The reductive dimerization of 6,6-dialkylfulvenes by elemental calcium
or strontium smoothly afforded the first ansa-metallocene derivatives
of these metals. The bright red 1,4-diazadiene adduct 1 was character
ized structurally.