HCo(PF3)4 and HCo(CO)4 react with Me2NSiMe3 to form [Me2N(H)SiMe3]+[Co(PF3)4]– and [Me2N(H)SiMe3]+[Co(CO)4]–, respectively; the last compound is also formed from the reaction of Me2NH with Me3SiCo(CO)4.
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Highsmith et al. (1971) studied this question.