Trimethylsilylcarbene and bis(trimethylsilyl) formaldehyde azine complexes of chiral bis(4-isopropyloxazolinyl)pyridine(dichloro)ruthenium(II)
Abstract
A mixture of [{RuIICl2(p-cymene)}2]1 and 2,6-bis(4-isopropyloxazolinyl)pyridine (pyboxip)2 was treated with trimethylsilyldiazomethane to give the trimethylsilylcarbene complex trans-[RuIICl2(pyboxip)(CHSiMe3)]3 at 0–15 °C in 94% yield and the azine complex trans-[RuIICl2(pyboxip)(Me3SiCHN–NCHSiMe3)] at 25–35 °C in 73% yield; the catalytic activity of 3 was examined for dimerization and asymmetric cyclopropanation with ethyl diazoacetate.