Rs. Varma et al., A facile preparation of alkyl azides from alkyl bromides and sodium azide using 18-crown-6 ether doped clay, SYN COMMUN, 29(16), 1999, pp. 2823-2830
A high yield synthesis of alkyl azides is described from readily accessible
alkyl bromides and sodium azide using a recyclable phase transfer catalyst
, 18-crown-6 ether impregnated clay.