Dokl. Akad. Nauk SSSR, 1960 Volume 130, Number 4,Pages 775–778(Mi dan39594)
CHEMISTRY
Alkylation of $4$-fluoroanisole by olefins in the presence of $\mathrm{BF}_3$,
$\mathrm{BF}_3\cdot\mathrm{H}_3\mathrm{PO}_4$
and $\mathrm{BF}_3\cdot\mathrm{O}(\mathrm{C}_2\mathrm{H}_5)_2$