Intramolecular B−N Coordination in Boratabenzene Complexes
作者:Arthur J. Ashe、Jeff W. Kampf、Jack R. Waas
DOI:10.1021/om960738i
日期:1997.1.1
(3-(dimethylamino)propyl)magnesium chloride followed by reaction with tert-butyllithium in ether affords lithium 1-(3-(dimethylamino)propyl)boratabenzene (8). The reaction of 8 with Mn(CO)3(CH3CN)3PF6 affords tricarbonyl[1-(3-(dimethylamino)propyl)boratabenzene]manganese(I) (15B). The crystalstructure of 15B shows that it exists in the intramolecularly B−N-coordinated form with a B−N bond distance of 1.716(5)
1-氯-1-硼环己基-2,5-二烯与(3-(二甲基氨基)丙基)氯化镁反应,然后与叔丁基锂在乙醚中反应,制得1-(3-(二甲基氨基)丙基)硼苯锂(8)。反应8与锰(CO)3(CH 3 CN)3 PF 6,得到三羰基[1-(3-(二甲氨基)丙基)boratabenzene]锰(I)(15B)。15B的晶体结构表明它以分子内B-N配位形式存在,其B-N键距为1.716(5)Å。但是在甲苯-d 8溶液15B中与它的开环异构体15A处于流动平衡。使用11 B NMR光谱法,在-35至48°C的温度范围内测量了15B → 15A的平衡常数,从而可以评估ΔH °(6.0 kcal / mol)和ΔS °(23 cal / mol K)。
Conformational Properties of Boron-Bridged Dimethylethylenediamino Bis(boratabenzene) Zirconium(IV) and Iron(II) Complexes
作者:Arthur J. Ashe、Saleem Al-Ahmad、Xiangdong Fang、Jeff W. Kampf
DOI:10.1021/om000861g
日期:2001.2.1
reaction of 14 with ZrCl4 afforded the boron-bridged dimethylethylenediamino bis(boratabenzene) zirconium dichloride complex 8, while reaction of 14 with FeCl2 afforded the corresponding dimethylethylenediamino-bridged iron(II) complex 9. The structures of 8 and 9 were determined by X-ray diffraction. In each case the boratabenzene units are bridged by an approximately C2-symmetric dimethylethylenediamino
Method for preparation of boratabenzene derivatives
申请人:Equistar Chemicals, L.P.
公开号:US20030055289A1
公开(公告)日:2003-03-20
The present invention provided an improved method for preparing a boratabenzene derivative. The invention includes an improved preparation of 1,4-pentadiyne, 1-haloboracyclohexa-2,5-diene, and 1-methylboracyclohexa-2,5-diene intermediates. These compounds are chemically labile and are not directly isolated from solution. Furthermore, the invention discloses an improved preparation of 1,1-dialkylstannacyclohexa-2,5-diene, another intermediate useful for preparing boratabenzene derivatives.
Boratastilbene: Synthesis, Structural Characterization, and Photophysics
作者:Bun Yeoul Lee、Shujun Wang、Markus Putzer、Glenn P. Bartholomew、Xianhui Bu、Guillermo C. Bazan
DOI:10.1021/ja993930v
日期:2000.4.1
Aminoboratabenzenes. An Evaluation of the Exocyclic B−N Interaction
作者:Arthur J. Ashe、Jeff W. Kampf、Christian Müller、Manuela Schneider
DOI:10.1021/om9506330
日期:1996.1.9
The reaction of 1-chloro-1-boracyclohexa-2,5-diene with diisopropylamine or N-benzyl-N-methylamine followed by reaction with LDA in THF affords lithium N,N-diisopropyl-1-aminoboratabenzene (9b) or lithium N-benzyl-N-methyl-1 -aminoboratabenzene (9c), respectively. The reaction of 9b with FeCl2 affords bis(N,N-diisopropyl-1-aminoboratab enzene)iron (18b), while the reaction of 9b or 9c with Mn(CO)(3)(CH3CN)(3)PF6 affords tricarbonyl[N,N-diisopropyl-1-aminoboratabenzene)manganese (19b) or tricarbonyl-1-(N-benzyl-N-methylamino) boratabenzene manganese (19b), respectively. Photochemical displacement of CO by PMe(3) from 19b affords dicarbonyl(trimethylphosphine) (N-benzyl-N-methyl-1-aminoboratabenzene)manganese (20b). The rates of bond rotation about the B-N bonds of 9c, 18b, 19b,c, and 20b have been determined using variable-temperature NMR spectroscopy. The rates depend markedly on the electron-withdrawing power of the coordinating metal group. The boron atom is weakly coordinated to manganese (B-Mn = 2.485(3) Angstrom) and strongly bound to nitrogen (B-N = 1.417 (3) Angstrom).