Synthesis and study of olefin metathesis catalysts supported by redox-switchable diaminocarbene[3]ferrocenophanes
作者:C. Daniel Varnado、Jr.、Evelyn L. Rosen、Mary S. Collins、Vincent M. Lynch、Christopher W. Bielawski
DOI:10.1039/c3dt51278a
日期:——
that 5 was sterically less bulky (%VBur = 28.4) than other known diaminocarbene[3]ferrocenophanes, which facilitated the synthesis of (5)(PPh3)Cl2Ru(3-phenylindenylid-1-ene) (18). Complex 18 exhibited quasi-reversible electrochemical processes at 0.79 and 0.98 V relative to SCE, which were assigned to the Fe and Ru centers in the complex, respectively, based on UV-vis and electron pair resonance spectroscopic
合成了氧化还原可切换的配体N,N'-二甲基二氨基卡宾[3]二茂铁烯(5),并掺入了一系列基于Ir和Ru的配合物。(5)Ir(CO)2 Cl(15)的电化学和光谱分析表明,5在中性状态下显示的Tolman电子参数值为2050 cm -1,在氧化时显示为2061 cm -1。此外,检查记录的(5)Ir(cis,cis -1,5-cyclooctadiene)Cl(13)的X射线晶体学数据显示,有5与其他已知的二氨基碳烯[3]二茂铁杂环烯相比,其空间体积较小(%V Bur = 28.4),这有助于合成(5)(PPh 3)Cl 2 Ru(3-苯基茚基-1-烯)(18)。配合物18在相对于SCE的0.79和0.98 V处表现出准可逆的电化学过程,基于紫外可见光谱和电子对共振光谱测量,它们分别分配给配合物中的Fe和Ru中心。新增中2,3-二氯-5,6-二氰基醌 在开环易位聚合过程中 顺,顺-1,5-环辛二烯被18催化([单体]