نتایج جستجو برای: tetra arms

تعداد نتایج: 35748  

Journal: :iranian journal of science and technology (sciences) 2007
a. jarrahpour

synthesis of some new monocyclic β-lactams containing a quaternary carbon center via a [2+2]cycloaddition reaction is described. the reaction of achiral diphenyl ketene with chiral aldimines derivedfrom chiral 2, 3, 4, 6-tetra-o-acetyl-β-d-galactopyranosylamine, 2, 3, 4, 6-tetra-o-acetyl-β-dglucopyranosylamine and different benzaldehydes resulted in the formation of β-lactams as singlediastereo...

2012
Fahimeh Sabbaghi Mehrdad Pourayoubi Marek Nečas Michal Babiak

The P atom in the title compound, C15H18NO3P, is in a distorted tetra-hedral P(O)(O)2N environment; the bond angles at P are in the range 98.16 (6)-115.82 (6)°. In the crystal, adjacent mol-ecules are linked via N-H⋯O=P hydrogen bonds into a chain running parallel to the b axis. The methyl groups are disordered over two sets of sites in a 0.677 (14):0.323 (14) ratio. The crystal studied was a n...

Journal: :Inorganic chemistry 2014
I V Andreev A L Tchougréeff P Kögerler R C Rai

A family of virtually isostructural tetra-capped ε-Keggin-type polyoxomolybdate(V) cluster compounds, [Mo12(V)O28(μ(2)–OH)10(μ(3)–OH)2{M(II)(H2O)3}4]·nH2O ({M4(II)Mo12(V)}, M = Ni, Co), exhibits magnetic-field-dependent optical response in their electronic absorption spectra in the 0–33 T range. On the basis of Effective Hamiltonian Crystal Field calculations, we find that the observed field-in...

2008
Hong-Ye Bai Hua Wu Jian-Fang Ma

The title compound {systematic name: 2,2',2'',2'''-[3,7,11,15-tetra-aza-1(1,4),5(1,3),9(1,4),13(1,3)-tetra-benzena-cyclo-hexadeca-phane-3,7,11,15-tetra-yltetra-methyl-ene]tetra-benzonitrile}, C(64)H(56)N(8), is a centrosymmetric macrocycle that is consolidated into the crystal structure by C-H⋯π inter-actions.

2011
Ling Gao Ronan Farrell

TErrestrial Trunked Radio (TETRA) offers capabilities equivalent to the second generation of mobile phones with voice and limited data capabilities. TETRA needs to evolve to satisfy increasing user demand for new services and facilities as well as gleaning the benefits of new technology. An initial enhancement (TETRA Enhanced Data Service, TEDS) has been agreed. The enhanced TETRA services allo...

Journal: :Crystals 2023

This work describes the synthesis of a novel zinc(II) porphyrin complex, namely [Meso-4α-tetra-(1,2,3-triazolyl)phenylporphyrinato]zinc(II) symbolized by 4α-[Zn(TAzPP)] (4), using click chemistry approach in presence copper iodide. All synthetic species reported herein were fully characterized elemental analysis, infrared spectroscopy, proton nuclear magnetic resonance, UV-visible and fluoresce...

Journal: :Le Simplegadi 2018

Journal: :Nature 1971

Journal: :European Physical Journal C 2022

Abstract This paper is devoted to the study of exclusive charm and bottom bound states which are suitable, at least partially, for a non-relativistic description. Starting from simple choice quarkonia tetra-quark wave functions we their production cross sections, total widths more interesting decay properties. In particular, compute sections ground state scalar getting results compatible with v...

Journal: :The Biochemical journal 1966
A D Cross

Myxinol tetra-acetate was examined by both nuclear-magnetic-resonance and mass-spectral techniques. The results are compared with corresponding data for 5alpha-ranol tetra-acetate and 5alpha-cyprinol tetra-acetate. The structure deduced for myxinol tetra-acetate, 3beta,7alpha,16alpha,27-tetrahydroxy-5beta-cholestane, is in agreement with that simultaneously arrived at by Haslewood (1966).

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