Résumé
Synthesis of two new B(12) substituted derivatives of the closo -[1-CB 11 H 12 ] - anion ( 1 ) is reported. The zwitterionic derivative containing dioxane ring 12-[O(CH 2 CH 2 ) 2 O] + -1-CB 11 H 11 - 0 ( 2 ) was obtained in moderate yield using reaction of anion 1 with dioxane as solvent, induced by dimethyl sulfate. The anion [12-(HO)-1-CB 11 H 11 ] - ( 3 ) was obtained in high yield upon treatment of the parent anion with 80% H 2 SO 4 at high temperature. Both compounds containing reactive functionalities were designed to serve as useful synthons for a variety of synthetic purposes. The compounds were characterized by 11 B and 1 H high-field NMR, IR spectroscopy, mass spectrometry, melting points and TLC. Molecular structure of compound 2 was determined by single crystal X-ray diffraction analysis.