reported for preparing 1-chloroalkynes from alkynylsilanes using trichloroisocyanuric acid (TCCA) as chlorinating agent and AgNO3 for in situ desilylation. The method is selective for trimethylsilyl-protected alkynes relative to triisopropylsilyl-protected alkynes. alkynes -chlorination- electrophilic additions- imides - protecting groups