Cumulenyl carbenoid

A more complex cumulenyl carbenoid 80 may be generated in situ from 1,4-dihalobut-2-ynes and two equivalents of base (Scheme 3.21). Insertion into organozirconocene chlorides gives allenyl zirconium species 81, which are regioselectively protonated to afford enyne products 82 [38], The stereochemistry of the alkene in 82 stems from the initial elimination of hydrogen chloride to form 80. 

The insertion of allenyl carbenoids into Zr-C bonds is an interesting process for the generation of cumulenyl zirconium... 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

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