New dioxo–molybdenum(vi) and –tungsten(vi) complexes with N-capped tripodal N2O2 tetradentate ligands: Synthesis, structures and catalytic activities towards olefin epoxidation
作者:Yee-Lok Wong、Lok H. Tong、Jonathan R. Dilworth、Dennis K. P. Ng、Hung Kay Lee
DOI:10.1039/b926864b
日期:——
cis-dioxotungsten(VI) complexes [WO2(Ln)] (n = 1–5). The corresponding molybdenum analogues [MoO2(Ln)] (n = 1–5) were also prepared from the reaction of [MoO2(acac)2] (acac = acetylacetonate) with H2Ln (n = 1–3) or [MoO2Cl2(dme)] (dme = 1,2-dimethoxyethane) with H2Ln (n = 4 and 5). All these compounds were fully characterised by a wide range of spectroscopic methods. The molecular structures of [MoO2(Ln)]
源自di- /的一系列N 2 O 2三脚架四齿配体四叔丁基 替代的 2- [双(2-羟基苄基)氨基甲基] X (X = 吡啶 和 苯并咪唑)(H 2 L n(n = 1-4))和8- [双(3,5-二叔丁基-2-羟基苄基)]氨基喹啉(H 2 L 5)是通过4步反应流程合成的,该流程涉及顺序的甲酰化,还原,溴化和烷基化。用[WO 2 Cl 2(dme)]处理H 2 L n(n = 1-5)(dme = 1,2-二甲氧基乙烷) 在......的存在下 三乙胺 给了相应的 顺式-二氧杂钨(VI)络合物[WO 2(L n)](n = 1-5)。相应的钼类似物[的MoO 2(L Ñ)](Ñ = 1-5)也从[的MoO的反应来制备2(ACAC)2 ](ACAC =乙酰丙酮)与H 2 L n(n = 1-3)或[MoO 2 Cl 2(dme)](dme = 1,2-二甲氧基乙烷)且H 2 L n(n =