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Lithio(silyl)phosphides, such as Me2Si(PHLi)2 and Me3Si(PHLi), react with haloalkanes or -alkenes to form new cyclophosphines (I) and Me3Si-substituted alkenylphosphines, e.g., Me3SiP(H)CH2CH2CHCH2. The latter cyclizes efficiently to the silylphospholane II.
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Brandt et al. (1997) studied this question.
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