Preparation and X-ray crystal structures of 5,10-dibromo-nido-decaborane(14)

Abstract

The first example of a facially substituted dihalogeno-nido-decaborane( 14), 5,10-B1,H,,Br,, has been obtained from the reaction of Br, with Me,SnB,,H,,; its structure has been determined by X-ray crystallography.ALTHOUGH basal-[B( 1)-B(4)I1 and monofacial-[B(5)-B( lo)] halogen substituted nido-decaboranes( 14) are known,2 the more synthetically interesting decaboranes dihalogen substituted in the facial positions were unknown until now. We have prepared and characterized the first example of such a compound, 5,10-B,,H,,Br2 (1).

Electrophilic Methylation of Decaborane(14): Selective Synthesis of Tetramethylated and Heptamethylated Decaboranes and Their Conjugated Bases

“…In the current area, only one alkylated structure of 1 is available, namely, 1-Et- nido -B 10 H 13 . In addition to that, the list of iodo, and/or other halogeno (X) and trifluoromethylsulfonyl (OSO 2 CF 3 ), derivatives of 1 is limited to a few examples, e.g., the substituted lowest rim of 1 (i.e., I bonded either to B1 or to B2) − and the substituted upper rim of 1 (i.e., H in B6 and/or B9 positions substituted with X or OSO 2 CF 3 , , and Br bonded to B5 and B10). , In view of the recent permethylation or persubstitution methods reported by our − or other − laboratories, we have now tried to extend these synthetic strategies to compound 1 , a key species of the borane series, also taking into account that the methylation of the boron clusters usually provides more stable species suitable for further examinations.…”

Oxidative cleavage of dimethylstannaundecaborane: preparation and structural characterization of 5,10-dibromodecaborane(14)

“…-0.020 (10) B( 5) 0.055 (8) B (6) -0.079 ( 9 020 (8) B(9), B(10) B(3) 0.035 ( 9) B( 8) -0.086 ( 9) B( 9) 0.095 (9) B (10) -0.051 (8) Br(l), Br (2), Br(l) 0.000 (1) B( 5), B (10) Br( 2) 0.000 (1) B( 5) 0.000 (8) B (10) -0.003 (8) 0 Coefficients of the equations of the planes in the form ax + by + czd = 0; a = 4.2431, b = 6.9794, c = -5.8484, and d = 6.2822. Least-squares planes calculated according to W. C.…”

“…A preliminary account of this work has been published earlier. 6 Although a variety of basal-7,8 and monofacial-substituted8,9 halodecaboranes are known, the 5,10-B10H12 represents the first example of a facial disubstituted /jWo-halodecaborane ( 14). The results of our work are described below.…”

Periodic trends and easy estimation of relative stabilities in 11-vertex nido-p-block-heteroboranes and -borates

“…Removal of one vertex from a 12-vertex closo-heteroborane cluster also leads to 11-vertex nido-heteroboranes and -borates [2,4,5]. Experimentally known 11-vertex nido-heteroborane and -borate clusters include: group 14 heteroatoms, i.e., carbon [6][7][8][9], silicon [10][11][12][13], germanium [14][15][16][17] and tin [6][7][8][18][19][20][21]; group 15 heteroatoms, i.e., nitrogen, phosphorus [1,2], arsenic [5,[22][23][24][25][26][27][28][29][30][31][32] and antimony [33]; group 16 heteroatoms, i.e., sulfur [34], selenium [35][36][37][38][39][40][41] and tellurium [35-37, 42, 53]. Williams' qualitative rules predict isomers with lowcoordinate heteroatoms and separated heteroatoms to be preferred …”