Results 231 to 240 of about 3,188,454 (273)

New Synthesis of dl-sativene, dl-copacamphene, dl--sativenediol and dl-helminthosporal

Tetrahedron Letters, 1979
Abstract Photocycloadducts from dl-piperitone and 1,1-dimethoxyethylene afforded bicyclo[3.2.1]oct-6-en-8-one derivatives under glc conditions in excellent yields. The synthesis of the title sesquiterpenes was accomplished using the bridged bicyclic compounds as intermediates.
Mitsutoshi Yanagiya, Kimiyoshi Kaneko, Takashi Kaji, Takeshi Matsumoto   +3 more
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Vibrational spectral analysis of dl-valine dl-valinium and dl-methionine dl-methioninium picrates

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2006
A comparative study of infrared and Raman spectra of DL-valine DL-valinium picrate (DL-VVP) and DL-methionine DL-methioninium picrate (DL-MMP) at the room temperature in 4000-50 cm(-1) range helps to determine the effect of hydrogen bonds in these crystals.
M Briget, Mary, V, Sasirekha, V, Ramakrishnan   +2 more
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DL Visualize

Computer Physics Communications, 2001
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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dl‐Seryl‐dl‐Alanyl‐Glycyl‐Glycyl‐dl‐Alanyl‐Glycin und dl‐Alanyl‐Glycyl‐Glycyl‐dl‐Seryl‐dl‐Alanyl‐Glycin

Justus Liebigs Annalen der Chemie, 1958
Abstract1) Aus Carbobenzoxy‐Dl‐seryl‐Dl‐alanyl‐glycin‐azid und Glycyl‐Dl‐alanyl‐glycin‐benzylester wurden die Carbobenzoxy‐hexapeptid‐benzylester synthetisiert und durch fraktionierte Kristallisation nach katalytischer Hydrierung die vier Racemate A, B, C und D von Dl‐alanyl‐glycyl‐glycyl‐Dl‐alanyl‐glycin erhalten.—2) Zwei Racemate A und B des ...
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DL-Proline

Acta Crystallographica Section C Crystal Structure Communications, 2005
In the structure of DL-proline, C5H9NO2, the molecules are connected via classical intermolecular N-H...O hydrogen bonds involving the amine and carboxyl groups [N...O = 2.7129 (15) and 2.8392 (16) A], and form chains along the b-axis direction and parallel to (-101). The chains are linked into sheets via weak non-classical hydrogen bonds.
Sunnie, Myung, Maren, Pink, Mu Hyun, Baik, David E, Clemmer   +3 more
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DL-Alanine

Acta Crystallographica Section C Crystal Structure Communications, 2001
A determination of the structure of the title compound, C3H7NO2, leads to an accurate description of its molecular dimensions and crystal packing. As in the structure of the L-isomer, the molecules aggregate into alternating layers, each consisting of only one type of isomer. The molecules in each layer are interconnected through head-to-tail sequences
M, Subha Nandhini, R V, Krishnakumar, S, Natarajan   +2 more
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R-DLS: An Improved DLS Algorithm

2008 Seventh International Conference on Grid and Cooperative Computing, 2008
As dynamic-level scheduling algorithm does not consider the risk taken by resource nodes and users' demand, it proposes an analytic hierarchy process approach (AHP) based improved DLS algorithm. By such AHP approach, it manages the task provided by users, and obtains the weight value which reflects users' demand.
Liu Xiaoqian, Yang Shoubao, Wang Shuling, Xu Jing   +3 more
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Total Synthesis of Indole and Dihydroindole Alkaloids. VI. The total synthesis of some monomeric vinca alkaloids: dl‐Vincadine, dl‐vincaminoreine, dl‐vincaminorine, dl‐vincadifformine, dl‐minovine and dl‐vincaminoridine

Helvetica Chimica Acta, 1975
AbstractA synthetic approach to a variety of monomeric Vinca alkaloids is described. The sequence involves, among its crucial phases, the generation of appropriate nine‐membered ring intermediates which are then elaborated via a transannular cyclization approach to the desired natural products.
J P, Kutney, K K, Chan, A, Failli, J M, Fromson, C, Gletsos, A, Leutwiler, V R, Nelson, J P, de Souza   +7 more
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