Basic Explosive Forming Method

Isoxazolium salts can be prepared by appropriate general methods, although the low basicity of the isoxazoles and their sensitivity to nucleophilic attack may necessitate special care. The explosive nature of isoxazolium perchlorates must be noted.125 The preparation of isoxazolium salts containing bulky N-substituents can be very difficult, and the particular utility of such compounds in synthesis (see Section III,B,2) has prompted the development of new methods for preparing them. A noteworthy route involving the reaction of the isoxazole with a carbenium ion, formed from a suitable alcohol, is exemplified in Eq. (18).30,126... 

A useful method for the separation ofhydrazoic acid is by a column extraction technique using a mixed-bed ion-exchange resin, a strongly acidic resin in the [H form], and a weakly basic resin in the (OH" form). All cations and most anions are held on the column while hydrazoic acid runs through the column. Other cations and anions elute as water. Weak acids, e.g., boric, silicic, and carbonic will also run through the column. The technique has not been applied to the analysis of explosive azides however, it has been used for the analysis of alkali azides and for the preparation of standard solutions of hydrazoic acid [18]. 

Table VI reveals a marked difference in the character of the chemical bond in beryllium and magnesium azides from the rest of group IIA, and the chemical properties and methods of preparation differ accordingly. Beryllium and magnesium azides are moisture sensitive the former decomposes hydrolytically to Be(OH)2, and the latter forms basic azides. Hence, they are made in water-free media such as Hquid ammonia, anhydrous hydrazine, or organic solvents. They deflagrate only weakly when ignited with a flame and are not sensitive to mechanical shock. The other IIA azides can be made in aqueous media, in which they are soluble some form hydrates in the soHd state, and they have the property of explosion. BeryUium azide is the only member of the group which is polymeric.

---