An original catalytic synthesis of boriran-1-ols

2-Alkylboriran-1-ols were obtained in a one-pot process by hydrolysis of 1-fluoro- and 1-chloroboriranes in 90–92% yield. The starting 1-haloboriranes were generated by cycloboration of α-olefins with BCl 3 ·SMe 2 or BF 3 ·THF in the presence of Mg metal (acceptor of halogen ions) and Cp 2 TiCl 2 catalyst.