Investigation of a dichlorodioxomolybdenum(vi)-pyrazolylpyridine complex and a hybrid derivative as catalysts in olefin epoxidation
作者:Tatiana R. Amarante、Patrícia Neves、Filipe A. Almeida Paz、Anabela A. Valente、Martyn Pillinger、Isabel S. Gonçalves
DOI:10.1039/c3dt52981a
日期:——
Treatment of the solvent adduct [MoO2Cl2(THF)2] with the ligand 2-(1-pentyl-3-pyrazolyl)pyridine (1, abbreviated as pent-pp) gave the dioxomolybdenum(VI) complex [MoO2Cl2(pent-pp)] (2), which was characterised by elemental analysis, 1H NMR, FT-IR spectroscopy and single crystal X-ray diffraction (XRD). Reaction of 2 with water in a Teflon-lined stainless steel autoclave at 100 °C led to the isolation
用配体2-(1-戊基-3-吡唑基)吡啶(1,缩写为pent-pp)处理溶剂加合物[MoO 2 Cl 2(THF)2 ],得到二氧钼(VI)配合物[MoO 2 Cl 2(pent-pp)](2),其通过元素分析,1 H NMR,FT-IR光谱和单晶X射线衍射(XRD)表征。2在100°C的铁氟龙衬里不锈钢高压釜中与水反应,导致分离出组成为[Mo 2 O 6(pent-pp)]的氧化钼/吡唑基吡啶杂化材料(3),其特征在于采用可变温度粉末XRD,扫描电子显微镜,热重分析,FT-IR和13 C 1 H} CP MAS NMR光谱学。化合物2和3用作顺式环辛烯在55°C时以叔丁基过氧化氢为氧化剂进行环氧化的(预)催化剂时,具有较高的活性和选择性。使用生物衍生的烯烃DL-柠檬烯(Lim)和油酸甲酯(Ole),以3作为(预)催化剂进行了进一步的催化实验。Lim的反应主要产生1,2-环氧-p -menth-8-烯和1