Catalytic Oxo/Imido Heterometathesis by a Well-Defined Silica-Supported Titanium Imido Complex
作者:Pavel A. Zhizhko、Andrey V. Pichugov、Nikolai S. Bushkov、Florian Allouche、Anton A. Zhizhin、Dmitry N. Zarubin、Nikolai A. Ustynyuk
DOI:10.1002/anie.201804346
日期:2018.8.20
gives the well‐defined silica‐supported Ti imido complex (≡SiO)Ti(=NtBu)(Me2Pyr)(py)2, which is fully characterized by IR and solid‐state NMR spectroscopy as well as elemental and mass balance analyses. While stoichiometric imido‐transfer reactivity is typical for Ti imides, the obtained surface complex is unique in that it enables catalytic transformations involving Ti imido and oxo intermediates. In
将Ti(= N t Bu)(Me 2 Pyr)2(py)2(Me 2 Pyr = 2,5-二甲基吡咯基,py =吡啶)接枝到在700°C下部分脱羟基的二氧化硅表面上,得到定义明确的二氧化硅支持的钛亚氨基络合物(≡SiO)Ti(= N t Bu)(Me 2 Pyr)(py)2,通过IR和固态NMR光谱以及元素和质量平衡分析进行了全面表征。尽管化学计量的酰亚胺转移反应是钛酰亚胺的典型特征,但所获得的表面配合物却是独特的,因为它能够进行涉及钛酰亚胺和氧代中间体的催化转化。特别是,它可以有效地催化羰基化合物与N的酰亚胺化亚磺胺通过氧代/亚氨基异复分解。