Photoinitiators
2,4,6-Trimethyl benzoyl chloride is the route to TPO-class acylphosphine oxide photoinitiators, used in UV-curable coatings, inks, dental composites and 3D-printing resins. Colour and purity directly affect cure performance and yellowing.
Electronics and plating
Propargyl chloride is used to make brightening additives for nickel plating. Electronic-grade applications place tight limits on metallic and ionic contamination.
Silanes and fluorochemicals
Octanoyl chloride feeds thiocarboxylate silane coupling agents and perfluorooctanoic acid chemistry.
Crown ethers
Triethylene glycol dichloride is the standard precursor to 18-crown-6 and 4,13-diaza-18-crown-6 phase-transfer catalysts.