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The alkyls EuR2 (R = C(SiMe3)3) and YbR2 (R = C(SiMe3)2(SiMe2X), X = Me, CHCH2, or CH2CH2OEt) have been obtained from reactions between KR and MI2, and the ytterbium analogues of Grignard reagent...
Eaborn et al. (Tue,) studied this question.