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Tandem Deoxygenative Hydrosilation of Carbon Dioxide with a Cationic Scandium Hydridoborate and B(C6F5)3
preprintsubmitted on 07.11.2019, 18:52 and posted on 15.11.2019, 02:25 by Daniel W. Beh, Warren Piers, Benjamin S. Gelfand, Jian-Bin Lin
A scandium hydridoborate complex supported by the dianionic pentadentate ligand B2Pz4Py is prepared via hydride abstraction from the previously reported scandium hydride complex with tris-pentafluorophenyl borane. Exposure of [(B2Pz4Py)Sc][HB(C6F5)3] to CO2 immediately forms [(B2Pz4Py)Sc][HCOOB(C6F5)3] at room temperature. The formatoborate complex can also be synthesized directly from the starting material (B2Pz4Py)ScCl with Et3SiH and B(C6F5)3 while in the presence of an atmosphere of CO2 in 81% yield. This compound was evaluated as the transition metal component of a tandem deoxgenative CO2 hydrosilation catalyst. At 5% loadings, complete consumption of Et3SiH was observed along with CO2 reduction products, but conversion to an inactive scandium complex identified as (B2Pz4Py)ScOSiEt3 was observed
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in Dalton Transactions