Potassium [(1S)-1-azido-2-phenyl­eth­yl]trifluorido­borate

The title compound, K⁺·C₈H₈BF₃N₃⁻, is a salt containing the chiral organic trifluorido­borate anion. The organic anions and potassium cations are tightly bound to each other by the coordination K—F [2.654 (3)–3.102 (3) Å] and K—N [2.951 (4)–3.338 (4) Å] inter­actions. Thus, the potassium cation adopts a nine-vertex coordination polyhedron, which can be described as a distorted monocapped tetra­gonal anti­prism. In the crystal, the organic anions and potassium cations form layers parallel to (001). Weak C—H...π inter­actions between neighbouring phenyl rings further stabilize the crystal.

(3aS,4S,6S,7aR)-Hexahydro-3a,5,5-trimethyl-2-phenyl-4,6-methano-1,3,2-benzodioxaborole

The mol­ecule of the title compound, C₁₆H₂₁BO₂, comprises a chiral fused tricyclic system containing five-membered (1,3,2-dioxaborolane), six-membered (cyclo­hexa­ne) and four-membered (cyclo­butane) rings. The 1,3,2-dioxaborolane ring is almost planar (r.m.s. deviation = 0.035 Å), and the syn H and Me substituents at this ring are in an eclipsed conformation. The cyclo­hexane and cyclo­butane rings adopt sofa and butterfly conformations, respectively. The B atom has a trigonal–planar configuration (sum of the bond angles = 360.0°). The phenyl ring is practically coplanar with the 1,3,2-dioxaborolane ring [dihedral angle between the ring planes = 1.96 (8)°]. The absolute structure was determined from the known configuration of (+)-pinanediol which was used in the synthesis. In the crystal, weak C—H...π(Ph) inter­actions occur.