And in that case, certain amount of hydrogenation product was formed. This phenomena was also observed in the example of secondary C-H bond substrates, in which the activation energy raises from 7.7 to 10.4 kcal • mol -1 (II). For the primary C-H bond substrates, the barrier is 13.1 kcal•mol -1 (I), the reaction all gave hydrogenation products and no borylation products were obtained. To further demonstrate the utility of this borylation method, a gram-scale reaction of 1a was carried out under air (Scheme 7a), furnishing 2a in 59% isolated yield. The resulting borylation products could be further transformed to a series of functional groups (Scheme 7b). For example, the tertiary alcohol in γ-position of carbonyl compounds could be obtained by oxidation of the boron compound 2a. In addition, tertiary boronic esters underwent C-C bond formation with vinyl Grignard reagent to afford vinylation products 5. Treatment of 1a with KHF 2 yields the potassium trifluoroborate salt 6 in 63% yield.