1-Chloro-6,6-dimethyl-2-hepten-4-yne mainly due to keratin aggregation produce squalene, was squalene cyclooxygenase inhibition, squalene in the cells of a large number gathered in the form of lipid droplets penetrate fungal cell membrane, destruction of the membrane lipid composition, resulting in fungal death. A typical procedure for preparing of 1-chloro-6,6-dimethyl-2-hepten-4-yne using boron trichloride is as follows: Compound 1 (53 g, 0.38 mol) in 2800 mL of n-hexane was cooled to 10??15??. Boron trichloride (1 M in hexane, 480 mL, 0.48 mol) was added to the mixture at 15??20?? over a 10 min period. After 10 min of stirring at 20??, the mixture was quenched with 1000 mL of water and stirred for 10 min. The separated organic phase was washed with 20% NaCl, dried (MgSO4), and evaporated to afford the title compound 2 (57.1 g, 95%) in 9:1 E:Z ratio.