High‐energy‐density materials can be obtained by reaction of monosubstituted hydrazines with cyanogen azide to generate 1,5‐diaminotetrazole derivatives. Azidohydrazones are postulated as intermediates in this reaction (see scheme).
Seven membered heterocyclic Azepine and its derivatives have great pharmacological and therapeutic
implications. In this review, the literature of the last fifty years has been exploited for the synthesis, reaction, and biological
properties of these seven-member heterocyclic compounds. Most of the mechanisms involved the ring expansion of either
five or six-membered compounds using various methods such as thermally, photo-chemically, and microwave irradiation.
The systematically designed schemes involve the synthesis of different derivatives of azepine, azepinone, azepane, etc.
using similar moieties by the different researchers. However, there is much work yet to be done in the biological section, as
it is not explored and reported in the literature; therefore, N-containing seven-membered heterocycles still have much scope
for the researchers.
SUMMARY
This article describes the clinical protocol of using potassium iodide (KI) to reverse staining caused by silver diamine fluoride (SDF). SDF contains silver, fluoride, and ammonia. It has been used to arrest dental caries mainly in pediatric applications. The major drawback of SDF application is the dark staining of both teeth and restorative materials. Hence, its use on adult dentition is limited. Improving the esthetic outcome by stain reduction would greatly enhance the opportunity for SDF's universal use. This case demonstrates how KI can effectively reverse the staining.
The first silver-FOX, silver-ammonia-FOX, and silver-amine-FOX compounds were synthesized by the reactions of silver nitrate with K-FOX or guanidine-FOX in water, aqueous ammonia, and amines, respectively. The crystal structure of silver-ammonia-FOX exhibits unique covalent bonding behavior, which is supported by NBO calculations.
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