fig12
Figure 12. Catalytic asymmetric [4 + 1] cyclization reaction of sulfonium ylides with the in situ generated ortho-quinone methides. This figure is used with permission from the Wiley-VCH Verlag[62].
Figure 12. Catalytic asymmetric [4 + 1] cyclization reaction of sulfonium ylides with the in situ generated ortho-quinone methides. This figure is used with permission from the Wiley-VCH Verlag[62].
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