CAS Registry Number

CAS 26412-87-3 — Sulphur trioxide pyridine complex

Sulphur trioxide pyridine complex is a reactive intermediate formed by the adduct of sulphur trioxide with pyridine, primarily used in sulfonation reactions, dye synthesis, and organic transformations requiring controlled SO₃ delivery. This complex offers a safer alternative to handling pure sulphur trioxide gas, improving reaction selectivity and yield in industrial and laboratory settings. CAS 26412-87-3, molecular formula C₅H₅NO₃S, molecular weight 159.17 g/mol. Store at ambient conditions in a cool, dry place. Signal word: Danger (corrosive, reacts violently with water). Molekula supplies Sulphur trioxide pyridine complex from research to bulk quantities with full documentation and ISO 9001:2015 traceability.