Successful realization of detonation-induced h-BN -> c-BN phase transition requires that a hydrolysis of BN by water from the detonation products is suppressed. For this two kinds of experiments for synthesis of c-BN were attempted: using benzotrifuroxan (with no water in products) as an explosive, in 80% yield; and using the cast 50% TNT + 50% RDX charges containing 5-25 wt.-% of h-BN powder in order to expend water from the detonation products by a part of BN, and to realize the phase transition in the rest, in 10% yield.