Seleniranium and Telluriranium Salts

• Applicant: Dr. Helmut Poleschner
• Subject Area: Inorganic Molecular Chemistry - Synthesis and Characterisation
• Term: from 2010 to 2014
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 164293302

The concept is the synthesis, isolation and structure elucidation of chiral seleniranium salts, which are discussed as key intermediates in the asymmetric synthesis with optically active electrophilic selenium reagents Ar*Se+ X- by addition on prochiral olefins like styrene or ß-methylstyrene. Experiments are planned for preparation, crystallisation and X-ray structure analysis of telluriranium salts with reactions of RTe+ BF4- and bulky olefins like bisadamantyliden. The bonding state in the three-membered rings of selenirenium and seleniranium salts should be characterised by experimentally derived charge density distribution from high resolution X-ray diffraction data. Appropriate anions composed of light elements are FB(C6F5)3- and B(C6F5)4-.

• DFG Programme: Research Grants