Tetrabutylammonium 2-[2,5-dimethyl-3-(4-nitrophenyl)-2,3-dihydro-1,2,4-oxadiazolium-4-yl]nonahydro-closo-decaborate

Abstract

The title ionic compound, C 16 H 36 N + ·C 10 H 20 B 10 N 3 O 3 − , consists of a tetra­butyl­ammonium cation and a closo -deca­borate cluster anion, which is bound to the substituted 2,3-dihydro-1,2,4-oxadiazole ring through a B—N bond [1.540 (2) Å]. The distances between connected B atoms in the deca­borate cluster range from 1.689 (2) to 1.844 (2) Å. The 2,3-dihydro-1,2,4-oxadiazole ring adopts an envelope conformation with the N atom as the flap atom.

Borylated Tetrazoles from Cycloaddition of Azide Anions to Nitrilium Derivatives ofcloso-Decaborate Clusters

“…The single-crystal X-ray diffraction studies conducted for 2c , 5 , and 6′ (Figures , ) indicate the presence of three ( 2c ) or two ( 5 and 6′ ) independent ionic parts. All bond lengths and angles of the cationic parts are the same, within 3σ, as those previously described in the literature. , The anionic parts of 2c , 5 , and 6′ consist of the closo -decaborate cluster linked to the substituted tetrazole ring via the N(1) atom. In the cluster part, the B–B bond distances and angles are typical for 2-substituted-nonahydro- closo -decaboron clusters. , The bond lengths N(1)–B(2) are equal, within 3σ, to those in the starting borylated nitrile .…”

“…All bond lengths and angles of the cationic parts are the same, within 3σ, as those previously described in the literature. , The anionic parts of 2c , 5 , and 6′ consist of the closo -decaborate cluster linked to the substituted tetrazole ring via the N(1) atom. In the cluster part, the B–B bond distances and angles are typical for 2-substituted-nonahydro- closo -decaboron clusters. , The bond lengths N(1)–B(2) are equal, within 3σ, to those in the starting borylated nitrile . Bond distances and angles of the heterocyclic ring of 2c are typical for 1,5-disubstituted tetrazoles. , In the tetrazole ring of 5 , the bond lengths C(5)–N(4) (1.335(2) Å) and C(5)–N(1) (1.327(2) Å) are equal, while the N(2)–N(3) bond (1.287(2) Å) is shorter than N(1)–N(2) (1.367(2) Å) or N(3)–N(4) (1.349(2) Å).…”

“…In the cluster part, the B−B bond distances and angles are typical for 2substituted-nonahydro-closo-decaboron clusters. 1,48 The bond lengths N(1)−B(2) are equal, within 3σ, to those in the starting borylated nitrile. 49 Bond distances and angles of the heterocyclic ring of 2c are typical for 1,5-disubstituted Scheme 2.…”

“…All bond lengths and angles of the cationic parts are the same, within 3σ, as those previously described in the literature. 15,48 The anionic parts of 2c, 5, and 6′ consist of the closo-decaborate cluster linked to the substituted tetrazole ring via the N(1) atom. In the cluster part, the B−B bond distances and angles are typical for 2substituted-nonahydro-closo-decaboron clusters.…”

Zinc(ii)-mediated generation of 5-amino substituted 2,3-dihydro-1,2,4-oxadiazoles and their further ZnII-catalyzed and O2-involving transformations

“…Only one work reported metal-free structures of DHODs, 61 whereas more examples of structurally characterized metal-bound DHODs were previously reported and these structures include DHOD complexes of Pd II , 16 Pt II , 14,15,[19][20][21][26][27][28][63][64][65] Pt IV , 19,21 and closo-decaborate clusters bearing the DHOD moiety. 46,66 Zn II -Catalyzed and O 2 -involving transformations of DHODs…”