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A real ghost: The [TIPS-box/Cu(OTf)2] complex (box = isopropylidene-2,2-bis(oxazoline)) is a catalyst of the Diels–Alder and the 1,3-dipolar cycloaddition between acryloyl-1,3-oxazolidin-2-one with cyclopentadiene and diphenylnitrone with ee values of 75 and 85 %, respectively. The reacting complex (see figure) of the above reactions was, for the first time, isolated and its structure determined by X-ray spectroscopy.
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Desimoni et al. (2009) studied this question.
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