The invention relates to a novel process for the synthesis of 2,4,6,8-tetranitro-2,4,6,8-tetraaza bicyclo [3.3.0] octane (bicyclo-HMX) by reaction in the presence of fluoride ions, nitronium tetrafluoroborate with 2,4,6,8-tetraacetyl tetraaza-2,4,6,8-bicyclo [3.3.0.] octane. BR/ The process makes it possible to obtain bicyclo Pure HMX with correct performance. BR/ Bicyclo-HMX is an explosive that can be used as an explosive or propellant charge in solid pyrotechnic compositions. / P
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