Boron compound complexing reagents, intermediate reagents of those reagents and methods of synthesizing these reagents are disclosed. These reagents, including those shown as General Formula (I) and General Formula (II) may be used, after further reactions described herein, to complex with boronic compounds, such as phenylboronic acid or derivatives thereof. Boron compound complexing reagents, boron compound complexes, and methods of synthesizing these reagents and complexes are disclosed. These reagents and complexes include those shown in General Formula (CIII), General formula (CIV), and General Formula (CVI). In one embodiment, the reagents of General formula (CIII) may be used to produce, after condensation with a bioactive species (BAS), the reagent of General Formula (CIV). The reagent of General Formula (CIV) may be used to form a complex with a boron compound, such as a complex shown in General Formula (CVI).