The last developments in our research efforts involving allenylzinc reagents are summarized. These interesting organometallic compounds allow the stereoselective and enantioselective synthesis of acetylenic epoxides, aziridines and amino alcohols. Some synthetic applications of these highly functionalized substrates are also presented through the synthesis of homopropargylic alcohols and allenic ketones. Further applications in the total synthesis of heterocyclic natural products are also discussed.