Mass spectra of some dialkylbenzoxazoles and 1,2-benzisoxazoles was written by Lozynski, Marek;Krzyzanowska, Ewa;Matecka, Dorota. And the article was included in Polish Journal of Chemistry in 1990.Electric Literature of C9H9NO This article mentions the following:
The mass spectra of several 3,5-dialkyl-1,2-benzisoxazoles and isomeric 2,5-dialkylbenzoxazoles have been measured. The fragmentation of di-Me derivatives has been considered to proceed via an iso-π-electronic structure with the azulene ion, taking into account that the cleavage of the N-O linkage followed by carbon monoxide expulsion is prefered. For all 5-alkyl isomers, rupture of the benzylic C-C bond is predominant. If a long alkyl substituent is present in the heterocyclic ring, intensive peaks due to the McLafferty rearrangement as well as to γ-cleavage are observed Fragmentation of compounds containing an aliphatic chain in different positions in relation to nitrogen gives the possibility of determining the structure of the heterocyclic ring. In the experiment, the researchers used many compounds, for example, 2,5-Dimethylbenzoxazole (cas: 5676-58-4Electric Literature of C9H9NO).
2,5-Dimethylbenzoxazole (cas: 5676-58-4) belongs to benzoxazole derivatives. Benzoxazole derivatives have different biological activities. Due to its versatile biological properties, benzoxazole has been incorporated as an essential pharmacophore and substructure in many medicinal compounds.Electric Literature of C9H9NO
Referemce:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem