Solid-State NMR and DFT Studies on the Formation of Well-Defined Silica-Supported Tantallaaziridines: From Synthesis to Catalytic Application
作者:Bilel Hamzaoui、Jérémie D. A. Pelletier、Edy Abou-Hamad、Yin Chen、Mohamed El Eter、Edrisse Chermak、Luigi Cavallo、Jean-Marie Basset
DOI:10.1002/chem.201504439
日期:2016.2.24
Single‐site, well‐defined, silica‐supported tantallaaziridine intermediates [≡Si‐O‐Ta(η2‐NRCH2)(NMe2)2] [R=Me (2), Ph (3)] were prepared from silica‐supported tetrakis(dimethylamido)tantalum [≡Si‐O‐Ta(NMe2)4] (1) and fully characterized by FTIR spectroscopy, elemental analysis, and 1H,13C HETCOR and DQ TQ solid‐state (SS) NMR spectroscopy. The formation mechanism, by β‐H abstraction, was investigated
Fast Titanium‐Catalyzed Hydroaminomethylation of Alkenes and the Formal Conversion of Methylamine
作者:Jens Bielefeld、Sven Doye
DOI:10.1002/anie.202001111
日期:2020.4.6
The scientific interest in catalytic hydroaminoalkylation reactions of alkenes has vastly increased over the past decade, but these reactions have struggled to become a viable option for general laboratory or industrial use because of reaction times of several days. The titanium-based catalytic system introduced in this work not only reduces the reaction time by several orders of magnitude, into the