Synthesis and Molecular Structure of 12-Iodo-1-(4-pentylquinuclidin-1-yl)-1-carba-closo-dodecaborane
摘要:
Trialkylation of 1-amino-1-carba-closo-dodecabarane with 1-bromo-3,3-bis(2-bromoethyl)octane affords 1-(4-pentylquinuclidin-1-yl)-1-carba-closo-dodecaborane in 29% yield which can then be iodinated to form title compound 1 in 40% yield. The molecular and crystal structure of 1 has been determined by X-ray crystallography [C13H33B11IN, monoclinic P2(1)/c: a 10.3405(2) Angstrom, b = 16.4404(1) Angstrom, c = 12.7223(2) Angstrom, beta = 100.156(1)degrees, Z = 4]. The structural features of 1 are compared with those in analogous compounds. The B-I bond length (2.196(6) Angstrom) is an intermediate value between those found in neutral iodocarboranes and charged B12H11I(-2). NMR data is correlated with the structure of 1 and the additivity of NR3 and halogen substituent effects is tested.
Synthesis and Characterization of Quinuclidinium Derivatives of the [<i>closo</i>-1-CB<sub>11</sub>H<sub>12</sub>]<sup>−</sup> Anion as Potential Polar Components of Liquid Crystal Materials
作者:Jacek Pecyna、Piotr Kaszyński、Bryan Ringstrand、Damian Pociecha、Serhii Pakhomov、Andrew G. Douglass、Victor G. Young
DOI:10.1021/acs.inorgchem.6b00319
日期:2016.4.18
high temperature in-plane ordered smectic phases that are stabilized by dipolar interactions. The ordered phases were investigated by powder XRD methods. Thermal and dielectric parameters for two derivatives, 1[0] and 1[6], were evaluated in nematic hosts, ClEster and BPhF. The dielectric data were analyzed with the Maier-Meier formalism augmented with density functional theory methods, and the results
1-Bromo-3,3-<i>bis</i>(2-bromoethyl)alkanes: Precursors to 4-Substituted Quinuclidines and 1-Phosphabicyclo[2.2.2]octanes
作者:Kerim A. Bairamov、Andrew G. Douglass、Piotr Kaszynski
DOI:10.1080/00397919808005108
日期:1998.2
Abstract 1-Bromo-3,3-bis(2-bromoethyl)octane has been synthesized from tetrahydro-4H-pyran-4-one in 6 steps and 18% overall yield. This method is more convenient, gives higher overall yields and is potentially more general than those previously reported for related tribromides.
Synthesis and Molecular Structure of 12-Iodo-1-(4-pentylquinuclidin-1-yl)-1-carba-<i>c</i><i>loso</i>-dodecaborane
作者:Andrew G. Douglass、Zbynek Janousek、Piotr Kaszynski、Victor G. Young
DOI:10.1021/ic980775x
日期:1998.11.1
Trialkylation of 1-amino-1-carba-closo-dodecabarane with 1-bromo-3,3-bis(2-bromoethyl)octane affords 1-(4-pentylquinuclidin-1-yl)-1-carba-closo-dodecaborane in 29% yield which can then be iodinated to form title compound 1 in 40% yield. The molecular and crystal structure of 1 has been determined by X-ray crystallography [C13H33B11IN, monoclinic P2(1)/c: a 10.3405(2) Angstrom, b = 16.4404(1) Angstrom, c = 12.7223(2) Angstrom, beta = 100.156(1)degrees, Z = 4]. The structural features of 1 are compared with those in analogous compounds. The B-I bond length (2.196(6) Angstrom) is an intermediate value between those found in neutral iodocarboranes and charged B12H11I(-2). NMR data is correlated with the structure of 1 and the additivity of NR3 and halogen substituent effects is tested.