1,3-Elimination in ?-halogen- and ?-ammonium-1-boraadamantane ate-complexes

1. Complexes of 2-(2-halogenoidethyl)-1-boraadamantanes with tetrahydrofuran and pyridine have been synthesized by the hydroboration-isomerization of 3-methoxy-7-(3-halogenoidpropyl)-3-borabicyclo[3.3.1]non-6-enes. 2. 4-Chloro-, and 2-(2-halogenoidethyl)-, and 2-(2-trimethylammoniumethyl)-1-boraadamantane ate-complexes undergo self-induced 1,3-elimination, resulting in the formation of substituted 3-borabicyclo[3.3.1]nonanes containing a cyclopropane fragment.