Molecular addition compounds. 6. Addition compounds of ethylenediamine with boron trifluoride and dialkylboranes

Article abstract of DOI:10.1021/ic50191a011

Ethylenediamine (EDA) reacts readily with boron trifluoride in ether to give the insoluble mono adduct NH₂CH₂CH₂NH₂·BF₃. The amine also reacts with dialkylboranes in a 1:2 molar ratio to provide the bis adducts EDA·2BHR₂. The latter adducts are quite stable and can be stored at 0°C without detectable isomerization or redistribution. In ether or THF, boron trifluoride readily and quantitatively removes EDA from these adducts liberating the free dialkylboranes. Thus this procedure provides a new valuable means for storing dialkylboranes as their stable EDA adducts, with rapid regeneration of the parent dialkylborane as desired.