The catalytic borylation of arenes is well established as an extremely useful C-H functionalization methodology. However, catalytic intermolecular C-H borylation processes are almost exclusively limited to forming aryl-boronate esters (Aryl-B(OR)2), particularly pinacol derivatives (Ar-BPin, Fig. ). This is due to the commercially available and bench-stable precursors HBPin / B2Pin2 reacting appropriately with transition metal complexes to enable catalysis to form Ar-BPin products that have considerable synthetic utility. In contrast, catalytic intermolecular borylation to access other aryl boranes (i.e., non Ar-B(OR)2) is extremely rare despite the fact that many of these boranes display distinct reactivity profiles compared to the organo-boronate ester analogues. In this area a notable exception are the reports using H-BDan (1,8naphthalenediaminatoborane) in catalytic C-H borylation. However, the Aryl-BDan products and Aryl-BPin compounds are both weakly Lewis acidic at boron. In contrast, B-Ar-9borabicyclo-[3.3.1]-nonane compounds (Ar-BBN) are more Lewis acidic at boron which enables transformations that are not possible using Ar-B(OR)2/Ar-BDan. Furthermore, the hydroborane, 9-borabicyclo-[3.3.1]-nonane, (H-BBN)2, is commercially available, inexpensive, and widely used in synthesis. To date the use of (H-BBN)2 in catalytic intermolecular C-H borylation to form a range of Ar-BBN compounds is not reported to our knowledge (Fig. ), despite the high utility of these products. Figure : A: comparison of the current status of catalytic C-H borylation using X-B(OR)2 (X = H or B(OR)2) and (H-BBN)2. B: previous catalyzed C-H zincation and alumination. C: this work.