Source of materialAmixture of pyridine-4-boronic acid (61.5 mg, 0.5 mmol), CuI 2 (95.2 mg, 0.5 mmol), HNO 3 (0.5 ml) in water (10 ml) was placed in aTeflon-lined stainless steel Parr bomb. The bomb was heated at 433 Kfor 4dand then cooled naturally to room temperature. Suitable single crystal for X-ray analysis was obtained by slow evaporation.
Experimental detailsAll the hydrogen atoms were positioned geometrically and allowed to ride on their parent atoms with d(C-H) =0.93 Å and U iso (H) =1.2 U eq (C).
DiscussionThe previously described structures containing tetrakis-
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