Results 271 to 280 of about 1,726 (292)
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The mixed conformable partial derivatives
Periodica Mathematica Hungarica, 2020The paper introduces a modification of the so-called ``conformable derivative'' and applies it to functions of two variables. Like the conformable derivative itself, it is just a classical first derivative multiplied by a very simple factor that is independent of the function (this is evident, e.g. from Theorem 2.4), so it is really nothing more than a
Zhao, Chang-Jian, Cheung, Wing-Sum
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Conformation of acyclic derivatives of sugars
Carbohydrate Research, 1969Abstract The peracetylated diethyl dithioacetals of d -ribose, d -arabinose, d -xylose, d -lyxose, l -rhamnose, and l -fucose were studied in chloroform- d solution by n.m.r. spectroscopy at 100 MHz. Signals of all protons were assigned, assignments were verified by spin-decoupling, and first-order coupling-constants were determined.
D. Horton, J.D. Wander
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Conformations of acyclic sugar derivatives
Carbohydrate Research, 1972Abstract The p.m.r. spectra of all the fully acetylated pentitols and several fully acetylated hexitols have been analysed. Computation by iterative analysis and recourse to 250-MHz spectra were required in several cases. The vicinal coupling constants were used to determine the conformations of these compounds in solution.
S.J. Angyal, R. Le Fur, D. Gagnaire
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An Ahlfors Derivative for Conformal Immersions
The Journal of Geometric Analysis, 2013The author firstly defines the Ahlfors derivative \(\mathcal{A}\) of a conformal immersion \(F:(M^m,g)\to (P^n,h)\) that is the symmetric covariant tensor field of order two in \(M\) defined by \[ \mathcal{A}F=\mathcal{H}\varphi+\frac 12F^\ast(k_h h)+F^\ast\left(\nu^P_{F(M)}\right)-\frac 12 k_g g, \] where \(\| DF\| =e^\varphi\), the operator ...
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Conformational Analysis of Moreliene Derivatives
Journal of Natural Products, 1994The conformation of a series of 4,8,8-trimethyl-9-methyleneperhydro-1,5-methanonaphthalene (moreliene) derivatives [1-6] was determined from 1 H-nmr coupling constants in combination with molecular modeling calculations. While the conformation of ring A remains essentially the same within the series, the conformation of ring B is sensitive to ...
Carlos M. Cerda-García-Rojas +4 more
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The conformation of thietane derivatives
Tetrahedron, 1971Abstract The dipole moments of thietane derivatives were measured by the solution method, using benzene as a solvent; by comparing the observed and calculated values of these dipole moments the conformations and bond moments were also determined. 2,2-Diphenyl-3,4-dicyanothietane and 2,2-diphenyl-3,4-dichlorothietane have the same configuration as ...
S. Kumakura +3 more
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Conformational and electronic effects in dehydroaminoacid derivatives
Journal of Molecular Structure, 1986Abstract The electronic structure of the cyclic dipeptide of dehydrophenylalanine has been investigated by vapour-phase He(I) and He(II) UV photoelectron spectroscopy. Assignments are proposed by comparison with related molecules and supported by INDO/S calculations.
D. AJO +5 more
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Optical and Conformational Studies on Benzobisthiazole Derivatives
The Journal of Physical Chemistry B, 20102,6-Didodecyl-4,8-diphenyl-benzo[1,2-d;4,5-d']bisthiazole (3) and 2,6-didodecyl-4,8-dipyrrole-2-yl-benzo[1,2-d;4,5-d']bisthiazole (5) were synthesized, and their optical properties were investigated in solution and in the solid state. Compounds 3 and 5 were excited with the 325 nm He-Cd laser line to produce blue and green luminescence, respectively ...
Jun-Gill, Kang +7 more
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Conformations of cyclopropane derivatives
Journal of Molecular Structure, 1985Wolfgang H. Ries, Ivan Bernal
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Conformation of bicyclo [n.1.0] derivatives
Journal of Molecular Structure: THEOCHEM, 1981Giorgio Favini +2 more
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