Chiral arene ruthenium complexes as asymmetric Diels–Alder catalysts

Abstract
The cation [RuCl(L)(η 6 -mes)] + [L = 4-isopropyl-2-(2-pyridyl)-1,3-oxazoline] is synthesised diastereoselectively; treatment with AgSbF 6 gives a dication which is an enantioselective catalyst for the asymmetric Diels–Alder reaction between methacrolein and cyclopentadiene.

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