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Elsevier, Applied Catalysis A: General, 1-2(381), p. 161-168

DOI: 10.1016/j.apcata.2010.04.005

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Palladium-catalysed methylation of aryl halides in ionic liquids with stabilized AlMe3

This paper is available in a repository.
This paper is available in a repository.

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Abstract

A new protocol for the methylation of aryl halides using the AlMe3 analogue DABAL-Me3 in a VOC/IL biphasic system is described. Very good isolated yields and chemoselectivities (methylation vs homocoupling), were observed in alkylmethylimidazolium and DABCO-based ILs, in presence of a bulky substituted phosphine (XPhos) and the structurally related sulfonated phosphine (XPhosSO3H). Recycling experiments of the IL-catalyst systems were satisfactory only in case of the butyldimethylimidazolium IL due to catalyst loss to the VOC phase.