Comparison of Hydration of Terminal Alkynes Hydroboration/oxidation of terminal alkynes give aldehydes Terminal alkynes undergo two additions,giving a doubly hydroborated intermediate ■ Oxidation replaces both B by O and generates the aldehyde A terminal alkyne BR2 CHCH2CH2CH2C≡CH CHCH,CH2CH2CH2CH H0, H20 CHCH2CH2CH,CH,CH 1-Hexyne BR2 pH8 Hexanal (70%) Comparison of Hydration of Terminal Alkynes „ Hydroboration/oxidation of terminal alkynes give aldehydes „ Terminal alkynes undergo two additions, giving a doubly hydroborated intermediate „ Oxidation replaces both B by O and generates the aldehyde