Cyclobutylmagnesium bromides

It is remarkable that even cyclobutylmagnesium bromides react cleanly with titanium alkoxides to yield reactive titanacyclopropane intermediates that reductively cyclopropa-nate N,N-dialkylformamides. This constitutes the first synthesis of the highly strained N,N-dialkylbicyclo[2.1.0]pent-5-ylamines (Table 11.9, entries 29—31). 

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