A series of mononuclear and arene-soluble bis(phosphinimino)methyl derivatives of the heavier alkaline earth metals, calcium, strontium and barium, have been obtained by straightforward addition of two molar equivalents of [KN(SiMe3)2] to a mixture of [CH2(Ph2PNC6H2-Me3-2,4,6)2] and MI2 (M = Ca, Sr, Ba) in THF.
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Hill et al. (2003) studied this question.
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