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Wyświetlanie pozycji 1-10 z 66
Liquid crystalline radicals: discotic behavior of unsymmetrical derivatives of 1,3,5-triphenyl-6-oxoverdazyl
(The Royal Society of Chemistry, 2013)
A series of six 6-oxoverdazyl (1[10]) substituted with a total of three 3,4,5-tri(decyloxy)phenyl and/or 3,4,5-tri(decylsulfanyl)phenyl groups was investigated by thermal, XRD, spectroscopic, magnetic and photovoltaic ...
Zwitterionic pyridinium derivatives of [closo-1-CB_9H_10]− and [closo-1-CB_11H_12]− as high Δε additives to a nematic host
(Royal Society of Chemistry, 2013)
Substituted closo-carbaborate–pyridinium zwitterions were prepared in 35–50% yield by reacting 1-amino-closo-1-carbaborates with 4-alkoxypyrylium triflates. Two of the new materials, 1[6]d and 2[10]b, exhibit a high ...
How much do coulombic interactions stabilize a mesophase? Ion pair and non-ionic binary isosteric derivatives of monocarbaborates and carboranes
(Royal Society of Chemistry, 2014)
Replacement of the B− atom in the monocarbaborate anion, 1[10] or 1[12], and the N^+ atom in the pyridinium cation [Pyr] of a liquid crystalline ion pair with C atoms leads to an isoelectronic and isosteric non-ionic binary ...
Investigation of high Δε derivatives of the [closo-1- CB_9H_10] anion for liquid crystal display applications
(Royal Society of Chemistry, 2014)
Two series of polar compounds 3[n] and 4[n] with longitudinal dipole moments ranging from 10 to 17 D were synthesized and investigated as additives to two nematic hosts, ClEster and CinnCN. Compounds 3[n] do not exhibit ...
Multi-conformer molecules in solutions: an NMR-based DFT/MP2 conformational study of two glucopyranosides of a vitamin E model compound
(The Royal Society of Chemistry, 2016)
Overall conformations of both anomeric per-O-acetylated glucosyl derivatives of 2,2,5,7,8-pentamethylchroman-
6-ol were studied in the context of their high flexibility, on the basis of NMR spectra in CDCl3
solution and ...
THE REACTION OF TETRAMETHYLSILANE WITH BORON TRIBROMIDE
(Walter de Gruyter (Previously published by Freund Publishing House Ltd.), 2001-12-01)
The reaction of tetramethylsilane with boron tribromide in deuterochloroform in ambient
temperature or at 40°C led to bromotrimethylsilane (3) and to dibromomethylborane (4). Identity of products
was confirmed by NMR ...
1JCH couplings in Group14/IVA tetramethyls from the gas-phase NMR and DFT structural study: a search for the best computational protocol
(The Royal Society of Chemistry, 2014-05-15)
Four tetramethyl compounds EMe4 (E = C, Si, Ge, and Pb) were studied by high-resolution NMR spectroscopy in gaseous and liquid states at 300 K. Extrapolation of experimental vapor-phase C-H J-couplings to a zero-pressure ...
Who Receives Home-Based Perinatal Palliative Care: Experience from Poland
(Hindawi Publishing Corporation, 2013)
The current literature suggests that perinatal palliative care (PPC) programs should be comprehensive, initiated early,
and integrative. So far there have been very few publications on the subject of home-based PC of ...
Synthesis, Chemistry and Applications of 5-Hydroxymethyl-furfural And Its Derivatives
(ARKAT-USA, 2001-08-08)
HMF is a good starting material for the synthesis of precursors of various pharmaceuticals,
thermo-resistant polymers and complex macrocycles. Among these precursors, one can find 2,5-
furandicarbaldehyde and ...
Addition of Di(trimethylsilyl) Phosphite to Schiff Bases of 2,5-Diformylfuran
(MedJChem, 2011-11)
A series of 2,5-Furanyl-bis-(aminomethylphosphonic Acids) has been synthesized by the addition of di(trimethylsilyl) phosphite to azomethine bond of achiral Schiff bases derved from 2,5-diformylfuran. The stereochemical ...