Allenyl organometallics synthesis

Metalloamides are suitable for the synthesis of 1-metallovinyl aryl selenides (Scheme 44) and 1-metalloallenyl phenyl selenides (Scheme 45) from the corresponding vinyl or allenyl selenides. The synthesis of the latter organometallics is even more conveniently achieved by metallation of l-phe-nylseleno-l-propyne or by a two-step, one-pot sequence of reactions fiom 2-chloroallyl phenyl selenide (Scheme 45). 

There has been a growing interest in the organometallic chemistry of allenyl-containing complexes. Although mononuclear propargyl complexes have proved to be versatile reagents in the synthesis of heterome-tallic allenyl clusters and nucleophilic attack of diazoalkanes at C carbon atoms of /u.2-i7, i7 -coordinated acetylides is an effective... 

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