The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Yoshito Kishi - One of the best experts on this subject based on the ideXlab platform.
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Absolute configuration at the Tricarballylic Acid moieties of fumonisin B1 and AAL toxin TA
Tetrahedron Letters, 1995Co-Authors: Craig D Boyle, Yoshito KishiAbstract:The configuration at the chiral centers of the Tricarballylic Acid moieties of fumonisin B1 and AAL toxin TA are shown to be R, which is opposite to that recently suggested by others for the same natural products.
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absolute configuration at the Tricarballylic Acid moieties of fumonisin b2
Tetrahedron Letters, 1995Co-Authors: Craig D Boyle, Yoshito KishiAbstract:The configuration at the chiral centers of the two Tricarballylic Acid moieties of fumonisin B2 is shown to be R. This stereochemistry is opposite to that recently suggested by others for the Tricarballylic Acid portions of fumonisin B1 and AAL toxin TA.
Craig D Boyle - One of the best experts on this subject based on the ideXlab platform.
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Absolute configuration at the Tricarballylic Acid moieties of fumonisin B1 and AAL toxin TA
Tetrahedron Letters, 1995Co-Authors: Craig D Boyle, Yoshito KishiAbstract:The configuration at the chiral centers of the Tricarballylic Acid moieties of fumonisin B1 and AAL toxin TA are shown to be R, which is opposite to that recently suggested by others for the same natural products.
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absolute configuration at the Tricarballylic Acid moieties of fumonisin b2
Tetrahedron Letters, 1995Co-Authors: Craig D Boyle, Yoshito KishiAbstract:The configuration at the chiral centers of the two Tricarballylic Acid moieties of fumonisin B2 is shown to be R. This stereochemistry is opposite to that recently suggested by others for the Tricarballylic Acid portions of fumonisin B1 and AAL toxin TA.
Jack Harrowfield - One of the best experts on this subject based on the ideXlab platform.
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Uranyl Tricarballylate Triperiodic and Nanotubular Species. Counterion Control of Nanotube Diameter.
Inorganic chemistry, 2020Co-Authors: Pierre Thuéry, Youssef Atoini, Jack HarrowfieldAbstract:Tricarballylic Acid (propane-1,2,3-tricarboxylic Acid, H3 tca) was reacted with uranyl nitrate hexahydrate under solvo-hydrothermal conditions and in the presence of different additional cations, y...
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Uranyl Tricarballylate Triperiodic and Nanotubular Species. Counterion Control of Nanotube Diameter
Inorganic Chemistry, 2020Co-Authors: Pierre Thuéry, Youssef Atoini, Jack HarrowfieldAbstract:Tricarballylic Acid (propane-1,2,3-tricarboxylic Acid, H3 tca) was reacted with uranyl nitrate hexahydrate under solvo-hydrothermal conditions and in the presence of different additional cations, yielding four complexes which have been crystallographically characterized. [(UO2)2Ba(tca)2(H2O)4] (1), isomorphous to the PbII analogue previously reported, crystallizes as a triperiodic framework in which diperiodic uranyl–tca3– subunits with the hcb (honeycomb) topology are linked by carboxylate-bound BaII cations. Triperiodic polymerization is also found in [(UO2)2(tca)2Ni(cyclam)] (2) and [(UO2)2(tca)2Cu(R,S-Me6cyclam)] (3), but here the diperiodic uranyl–tca3– subunits have the sql (square lattice) topology, and the frameworks formed through bridging by NiII or CuII cations have different topologies, tcs in 2 and xww in 3. [Co(en)3][UO2(tca)]3·2H2O (4) crystallizes as a monoperiodic coordination polymer with the hcb topology and a nanotubular geometry. In contrast to the square-section nanotubules previously found in [NH4][(UO2)2Pb(tca)2(NO3)(bipy)] (bipy = 2,2′-bipyridine), those in 4 have a hexagonal section with a width of ∼7 Å. The structure-directing role of the hydrogen bonded counterions in these nanotubular species, either NH4+ located within the nanotubule cavity or [Co(en)3]3+ located outside, is discussed. Emission spectra in the solid state display the usual vibronic fine structure for 1 and 4, while uranyl emission is quenched in 3.
Robert L. Laduca - One of the best experts on this subject based on the ideXlab platform.
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Diverse stacked and entangled topologies in cadmium tricarballylate coordination polymers with nitrobenzene detection capability
Inorganica Chimica Acta, 2019Co-Authors: Gregory A. Farnum, Brianna L. Martinez, Jodi L. Meyer, Sean R. Pumford, Robert L. LaducaAbstract:Abstract Hydrothermal reaction of cadmium salts, Tricarballylic Acid (H3tca) and dipyridyl ligands resulted in generation of four coordination polymers that were characterized by single-crystal X-ray diffraction. The nature of the ancillary dipyridyl ligand plays a primary role in enforcing differing structural topologies across the series of new phases. [Cd2(tcaH)2(dpe)2]n (1, dpe = 1,2-di(4-pyridyl)ethane) displays a 2-fold interpenetrated 3D 41263 pcu net based on 6-connected {Cd2(O)(OCO)} cluster nodes. [Cd(tcaH)(dpp)(H2O)]n (2, dpp = 1,2-di(4-pyridyl)propane) manifests a 1D + 1D → 3D interlocked system of loop-containing perpendicular ribbon motifs. {[Cd4(tca)2(Htca)(bpmp)5(H2O)2]·27H2O}n (3, bpmp = bis(4-pyridylmethyl)piperazine) has intersecting [Cd4(tca)2(Htca)(H2O)2]n layer, [Cd(bpmp)(H2O)]n chain, and [Cd2(bpmp)3]n ladder submotifs and forms a complicated 3,4,5-connected trinodal 3D self-penetrated network with (6.92)(42638)(42638.9310) topology. {[Cd(tcaH)(Hbpmp)](ClO4)·5.5H2O}n (4) exhibits stacked cationic bilayer (4,4) grid slabs. All compounds showed potential as potential detectors for nitrobenzene in ethanol suspension via luminescence quenching, with 1 showing the highest uptake of analyte.
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Zinc Tricarballylate Coordination Polymers with a Threaded-Loop Self-Penetrated Layer and Triply Interpenetrated 3,4-Connected Binodal Network Structures: Topological Control through Anion Inclusion
Crystal Growth & Design, 2010Co-Authors: Gregory A. Farnum, Robert L. LaducaAbstract:Hydrothermal reaction of zinc perchlorate, Tricarballylic Acid (H3tca), and bis(4-pyridylmethyl)piperazine (bpmp) resulted in generation of {[Zn3(tca)2(bpmp)(Hbpmp)2](ClO4)2·5H2O}n (1), which possesses an unprecedented self-penetrated two-dimensional (2-D) layered topology with threaded-loop type linkages. A similar reaction using zinc sulfate as precursor afforded the oxoanion-free phase {[Zn3(H2O)4(tca)2(bpmp)2]·8H2O}n (2), which manifests a new yet simple 3-fold interpenetrated (63)(658) 3,4-connected three-dimensional (3-D) binodal network. Both materials undergo blue-violet luminescence upon exposure to UV radiation.
Hans-ulrich Humpf - One of the best experts on this subject based on the ideXlab platform.
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combined synthetic cd strategy for the stereochemical assignment of the Tricarballylic Acid side chains of fumonisin b1
ChemInform, 2001Co-Authors: Michaela Hartl, Hans-ulrich HumpfAbstract:The circular dichroism (CD) exciton chirality method was employed for the stereochemical assignment of the Tricarballylic Acid (TCA) side chains of fumonisin B1 1a (FB1). Using 2-naphthoate for chromophoric derivatization of the reduced TCA moieties, the absolute configuration was shown to be R. For additional confirmation, an optically active dihydroxy-tert-butanoate 2 related to the TCA group of fumonisin B1 was synthesized to serve as a model compound.
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Combined Synthetic/CD Strategy for the Stereochemical Assignment of the Tricarballylic Acid Side Chains of Fumonisin B1
The Journal of organic chemistry, 2001Co-Authors: Michaela Hartl, Hans-ulrich HumpfAbstract:The circular dichroism (CD) exciton chirality method was employed for the stereochemical assignment of the Tricarballylic Acid (TCA) side chains of fumonisin B1 1a (FB1). Using 2-naphthoate for chromophoric derivatization of the reduced TCA moieties, the absolute configuration was shown to be R. For additional confirmation, an optically active dihydroxy-tert-butanoate 2 related to the TCA group of fumonisin B1 was synthesized to serve as a model compound.
