Reactivity Diversification – Synthesis and Exchange Reactions of Cobalt and Iron 2‐Alkenylpyridine/‐pyrazine Complexes Obtained by Vinylic C(sp
<sup>2</sup>
)–H Activation
作者:Robert Beck、Sebnem Camadanli、Ulrich Flörke、Hans‐Friedrich Klein
DOI:10.1002/ejic.201500225
日期:2015.5
C,C-C5H4N–CH=CH–C10H6)Co(CO)(PMe3)2 (12), accompanied by the release of the N-coordination site. The carbonylation of (κ3-C,C,N-C5H4N–CH=C–C10H6)Fe(PMe3)3 resulted in the exchange of one PMe3 ligand with the retention of the coordination sites to generate (κ3-C,C,N-C5H4N–CH=C–C10H6)Fe(CO)(PMe3)2 (13). All new compounds were identified by NMR spectroscopy and structurally characterized by single-crystal
研究了 2-烯基吡啶衍生物与三甲基膦负载的铁和钴-甲基加合物的反应性,并通过平滑的乙烯基 C(sp2)-H 活化提供了一系列 C,N-环金属化配合物。Co(CH3)(PMe3)4 与 2-乙烯基吡啶、2-(1-苯基乙烯基)吡啶和 2-乙烯基吡嗪的反应提供了深绿色的五元金属环晶体 (κ2-C,N-R1R2C=CH) Co(PMe3)3(1:R1 = C5H4N,R2 = H;2:R1 = C5H4N,R2 = Ph;3:R1 = C4H3N2,R2 = H)。1-3 与碘甲烷的氧化加成得到 mer-trans 三价钴配合物 (κ2-C,N-R1R2C=CH)Co(CH3)I(PMe3)2 (4: R1 = C5H4N, R2 = H; 5: R1 = C5H4N,R2 = Ph;6:R1 = C4H3N2,R2 = H) 以适度的产量。2与另外当量的2-(1-苯基乙烯基)吡啶的反应引入了第二个C,具有