Acknowledgment.-The author is grateful to Mr. ... 8, 28861-40-7; cis-9, 28861-41-8; trans-9, 28861-42-9; B. L. Martin and Mr. Paul Ciavolella for technical 10, 28861-43-0; 11, 28861-44-1; 12, 28861-45-2; 13, ... Anal. Calcd for CzoHlaC11t: c, 35.23; H, 2.37- Found: c, ... 1,4,g-decatriene diadduct with hexach~orocyc~openta- ... Halogenated Ketenes. XXI. Cycloadditions with Carbonyl Compounds1" ... Department of Chemistry, North Texas State University, ...