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868 research data, page 1 of 87

Asymmetric Synthesis of Pyrrolidinoindolines. Application for the Practical Total Synthesis of (−)-Phenserine

Huang, Audris; Kodanko, Jeremy J.; Overman, Larry E. (2004)
Publisher: Figshare
A versatile route to enantiopure 3,3-disubstituted oxindoles and 3a-substituted pyrrolidinoindolines is described in which diastereoselective dialkylation of enantiopure ditriflate 10 with oxindole enolates is the central step. These reactions are rare examples of alkylations of prostereogenic enolates with chiral sp3 electrophiles that proceed with high facial selectivity (10−20:1). The scope of this method is explored, and a model to rationalize the sense of stereoselection is a...

N3 data of Kiel bay

Rumohr, Heye, H.; Fleischer, Dirk, D.; Leibniz Institute of Marine Sciences, Marine Ecology Division, Germany (2004)
Publisher: VLIZ

Temporal verification with transition invariants

Rybalchenko, Andrey (2004)
Publisher: Universität des Saarlandes
Embargo end date: 2007/09/10

Crystal-to-Crystal Guest Exchange of Large Organic Molecules within a 3D Coordination Network

Ohmori, Osamu; Kawano, Masaki; Fujita, Makoto (2004)
Publisher: Figshare
Single-crystal-to-single-crystal guest exchanges of large guest molecules [triphenylene (3a), anthracene (3b), perylene (3c), and triphenylphosphine oxide (3d)] were successfully performed in a large channel of a 3D coordination network (2) having a planar ligand, (1). Crystallographic analysis revealed efficient stackings between the planar guests (3a−c) and the ligand. The crystals of the inclusion complexes of 3a−c showed drastic color change because of strong donor−acceptor interactions b...

A key to Brazilian genera of Plecoptera (Insecta) based on nymphs

Neusa Hamada (2004)
Publisher: Plazi.org taxonomic treatments database
This dataset contains the digitized treatments in Plazi based on the original journal article Olifiers, Martina H., Dorvillé, Luís F. M., Nessimian, Jorge L., Hamada, Neusa (2004): A key to Brazilian genera of Plecoptera (Insecta) based on nymphs. Zootaxa 651: 1-15, DOI: 10.5281/zenodo.158008

A Set of Nonpolar Thymidine Nucleoside Analogues with Gradually Increasing Size

Kim, Tae Woo; Kool, Eric T. (2004)
Publisher: Figshare
We describe a series of nonpolar nucleoside analogues having similar shapes and gradually increasing size. The structure of the nucleobase thymine was mimicked with toluene derivatives, replacing O2/O4 with hydrogen, fluorine, chlorine, bromine, and iodine. Glycosidic bonds were formed by reactions of lithiated 2,4-dihalotoluenes with a deoxyribonolactone derivative. Structural analysis by NMR showed similar conformations across the series. The compounds are useful for study of the b...

Highly Phosphorescent Bis-Cyclometalated Iridium Complexes Containing Benzoimidazole-Based Ligands

Huang, Wei-Sheng; Lin, Jiann T.; Chien, Chin-Hsing; Tao, Yu-Tai; Sun, Shih-Sheng; Wen, Yuh-Sheng (2004)
Publisher: Figshare
New benzoimidazoles (bi) have been synthesized. These compounds readily undergo cyclometalation with iridium trichloride, and bis-cyclometalated iridium complexes, (bi)2Ir(acac) (bi = cyclometalated benzoimidazole; acac = acetylacetonate), can be isolated. One of the complexes, (fbi)2Ir(acac) (fbi = 2-(9,9-diethyl-9H-fluoren-2-yl-1H-benzoimidazole), was also characterized by single-crystal X-ray structural determination. Some of the complexes, (bi)2Ir(acac), are highly phosphoresc...

Atmospheric Pressure Photoionization. 1. General Properties for LC/MS

Hanold, Karl A.; Fischer, Stephen M.; Cormia, Patricia H.; Miller, Christine E.; Syage, Jack A. (2004)
Publisher: Figshare
In this work, we describe the performance of an atmospheric pressure photoionization (APPI) source for sampling liquid flows. The results presented here primarily focus on the mechanism of direct photoionization (PI), as compared to the dopant mechanism of PI. Measured detection limits for direct APPI were comparable to atmospheric pressure chemical ionization (APCI; e.g., 1 pg for reserpine). The ion signal is linear up to 10 ng injected quantity, with a useful dynamic rang...

Robust, Soluble Pentacene Ethers

Payne, Marcia M.; Delcamp, Jared H.; Parkin, Sean R.; Anthony, John E. (2004)
Publisher: Figshare
We report the synthesis and characterization of a series of alkoxy-substituted silylethynylated pentacene derivatives (R = CH2CH2, CHCH, CH2). All three compounds are easily prepared, soluble in common organic solvents, and stable both as solids and in solution. Two of the derivatives possess significant π-face interactions in the crystal. Values for λmax for these new pentacene derivatives range from 621 to 674 nm, and oxidation potentials lie between 109 and 301 mV versus ferrocene.