Next, to showcase the synthetic usefulness of these poly-borylated cyclobutane products, we mainly focused on the oxidation process of the diboryl moiety (in 3). Interestingly, under different sets of conditions, diverse oxygenated scaffolds 9 and 10 were obtained (Figure ). For example, using a sodium perborate (NaOB 3 ) as oxidation reagent, the cyclobutanone product 9a was generated with moderate yield. Thus, the combined processes of [2+2]-cycloaddition reaction followed by oxidation, demonstrated that gem-diborylalkenes 1 can serve as arylated ketene equivalents 11 in [2+2]-cycloadditions (See Figure ). = regioselectivity ratio. The dr (anti:syn) = diastereomeric ratio of 10c was determined by crude 1 H-NMR. The anti-relative configuration of 10c was determined by compression to reported literature.