Scheme 1.
a) Szeimies’ synthesis and reactivity bicyclo[1.1.0]but‐1(3)‐ene fragment 5. b) Isotopic labelling study of the rearrangement of lithiated 1‐bromobicyclo[1.1.0]butane 7. c) Hashmi's synthesis and rearrangement of TCH‐gold(I) complex 11.
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