Synthesis and properties of Fischer carbene complexes of N,N-dimethylaniline and anisole π-coordinated to chromium tricarbonyl
作者:Nora-ann Weststrate、Shalane Bouwer、Christopher Hassenrück、Nina A. van Jaarsveld、David C. Liles、Rainer F. Winter、Simon Lotz
DOI:10.1016/j.jorganchem.2018.05.022
日期:2018.8
The reaction of lithiated N,N-dimethylaniline π-coordinated to Cr(CO)3 with W(CO)6 and alkylation with [Et3O][BF4] afforded the o-, m- and p-isomers of the σ,π-bimetallic complexes η6-Me2NC6H4C(OEt)W(CO)5}Cr(CO)3 (o-, 1, m-, 2 and p-isomer, 3). A by-product of the reaction is found by the substitution of a carbonyl ligand in 1 by the aniline nitrogen atom to give η6-C,N-o-Me2NC6H4C(OEt)W(CO)4}Cr(CO)3
W(CO)6使配位为Cr(CO)3的锂化N,N-二甲基苯胺π与[Et 3 O] [BF 4 ]烷基化,得到σ的o-,m-和p-异构体,π-双金属络合物η 6 -Me 2 NC 6 H ^ 4 C(OET)W(CO)5 }的Cr(CO)3(ø - , - 1,米- ,2和p -异构体,3)。通过在1中取代羰基配体发现了反应的副产物由苯胺氮原子,得到η 6 -C,N- ö -Me 2 NC 6 H ^ 4 C(OET)W(CO)4 }的Cr(CO)3(4)。其结果是,在W-螯合环占主导地位的HOMO而非η 6 -arene的Cr(CO)3 }片段,影响第一氧化的部位。通过π配位到Cr(CO)3增强了茴香醚的活化,以及随后与n BuLi,W(CO)6和[Et 3 O] [BF 4 ]的反应仅产生了o取代的产物μ,η6 :1 - Ø-MeOC 6 H 4 C(OEt)W(CO)5 } Cr