Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Tetrahedron Letters called A practical, efficient, and rapid method for the oxidation of electron deficient pyridines using trifluoroacetic anhydride and hydrogen peroxide-urea complex, Author is Caron, Stephane; Do, Nga M.; Sieser, Janice E., which mentions a compound: 33216-52-3, SMILESS is C1=NC=C(C(=C1Cl)Cl)Cl, Molecular C5H2Cl3N, Formula: C5H2Cl3N.
A general method for the oxidation of electron-poor pyridines to their N-oxides using hydrogen peroxide-urea complex and TFAA in either CH2Cl2 or CH3CN was developed. The methodol. proved to tolerate a number of functional groups and substitution patterns and proceeded on notoriously difficult to oxidize substrates. For example, oxidation of 3,4-pyridinedicarboxylic acid di-Et ester under these conditions gave 3,4-pyridinedicarboxylic acid di-Et ester 1-oxide in 98% yield.
Compounds in my other articles are similar to this one(3,4,5-Trichloropyridine)Formula: C5H2Cl3N, you can compare them to see their pros and cons in some ways,such as convenient, effective and so on.
Reference:
Bromide – Wikipedia,
bromide – Wiktionary