Aryl is preferably to be understood as meaning C6-C20-aryl groups, such as, for example, phenyl, biphenyl, naphthyl, indenyl, fluorenyl etc. The aryl group can in this case be optionally mono- or polysubstituted by substituents which are inert under the reaction conditions, from the group ...
meaning saturated or unsaturated, straight-chain, branched or cyclic ketones. The ketones can be saturated or mono- or polyunsaturated. They can be unsubstituted, or substituted by groups which are inert under reaction conditions, for example by optionally substituted aryl or heteroaryl groups such ...