The reaction between [(C 5 Me 5 )TiF 3 ] or [(C 5 Me 4 Et)TiF 3 ] respectively in the presence of CaF 2 (prepared in situ) resulted in the formation of [{(C 5 Me 5 )TiF 3 } 4 CaF 2 ] 1 or [{(C 5 Me 4 Et)TiF 3 } 4 CaF 2 ] 2, an X-ray study of compound 2 showed it to possess a core analogous to a crown ether.
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Pevec et al. (1997) studied this question.
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