Cyclic borane derivatives of amino acids

Abstract

evacuated Kel-F T piece onto the SbF, that had been cooled to -196. The SbF,-XeF,-HF mixture was then warmed to and kept at room temperature for 5 min to ensure complete reaction. The mixture was then cooled to -64' and HF solvent removed under vacuum at this temperature. Preparation of ZXeF,.AsF, and XeF,.AsF,. A weighed amount of AsF, was distilled onto an XeF,-HF mixture kept at -196 (cu. 10 mmol of XeF, in 10 ml of HF). The procedure was then exactly the same as for the preparation of the XeF,-SbF, compounds.