Results 271 to 280 of about 269,366 (337)

Stabilization Effects in Phosphinyl Radicals: The Scope of the Donor, Acceptor, and Captodative Functionalization. [PDF]

Inorg Chem
Kaymak P, Benkő Z.
europepmc   +1 more source

Modeling the Mutational Effects on Biochemical Phenotypes of SARS-CoV-2 Using Molecular Fields. [PDF]

Biomolecules
Wang B, Xi Z.
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Visual quorum sensing in chiral suspensions: Hyperuniformity and edge currents. [PDF]

PNAS Nexus
Zhou Y, Yin Q, Nayak S, Bag P, Ghosh PK, Li Y, Marchesoni F.   +6 more
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Steric effects in alkylpyrimidines

Recueil des Travaux Chimiques des Pays-Bas, 1978
AbstractTreatment of solutions of 4,6‐dimethylpyrimidine and 4,6‐di‐t‐butylpyrimidine in acid with aliphatic acids (RCO2H) in the presence of silver nitrate and ammonium peroxydisulfate gave the 2‐R‐4,6‐dimethyl‐ and 2‐R‐4,6‐di‐t‐butylpyrimidines (R = C2H5, i‐C3H7, t‐C4H9). Ths pKa values of these compounds were measured.
van der Plas, H.C., Koudijs, A.
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Steric effects-II

Tetrahedron, 1980
The steric effect of alkyl groups as characterized by the revised Taft E's parameter is analysed using an approach based on the DARC topological system and its PELCO correlation method. This approach involves an analysis of the systemativ variation of E's in a topological dequencing of alkyl groups and shows the existence of three regions of distinct ...
Annick Panaye, John Anthony MacPhee, Jacques-Emile Dubois   +2 more
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Attractive steric effects

Journal of Chemical Education, 1973
Attractive steric effects cause some organic structures to be more stable when bulky side-groups are closer together.
A. Liberles, A. Greenberg, J. E. Eilers
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Steric effect on fluorescence quenching

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2005
In this communication we have reported the steric effect on the fluorescence quenching rate constants of the electron transfer (ET) process. We have done a comparative study using donor (D)-acceptor (A) systems with different exergonicity (-deltaG(f)). Different carbazole derivatives (CZ): 1,4-dicyanobenzene (DCB) systems (-deltaG(f) = 0.7-0.8 eV) were
Suchandra, Chatterjee, Samita, Basu, Nandita, Ghosh, Manas, Chakrabarty   +3 more
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Steric effects in heteroboranes

Journal of Organometallic Chemistry, 1994
Abstract In (Ph 3 PCu) 2 Ph 2 C 2 B 9 H 9 ( Ia ) and {( o -tol) 3 PCu} 2 Ph 2 C 2 B 9 H 9 ( Ic ) one copper atom occupies a polyhedral vertex position but is slipped away from the cage carbon atoms (the latter the more so) to relieve phosphine ṫ C cage -phenyl crowding. The second copper atom is exo -facially bonded to the B(8)B(9)B(12) triangular
Kerry J. Adams, Jill Cowie, Steven G.D. Henderson, Gillian J. McCormick, Alan J. Welch   +4 more
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Steric effects in dispersion forces interactions

Physical Review E, 2008
Classically, there have been two different ways to obtain mean-field theories for liquid crystals. One is based on short-range repulsive steric forces and the other on long-range attractive dispersion forces. In the former approach, it is the anisotropic shape of the molecules that leads to the anisotropic interaction, and in the latter it is the ...
SONNET A. M, VIRGA, EPIFANIO GUIDO GIOVANNI   +1 more
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On the origin of the steric effect

Physical Chemistry Chemical Physics, 2012
A quantitative analysis of the steric effect of aliphatic groups was carried out from first principles. An intuitive framework is proposed that allows the separation and straightforward interpretation of two contributors to the steric effect: steric strain and steric shielding (hindrance). When a sterically demanding group is introduced near a reactive
Pintér, Balasz, Fievez, Tim, Bickelhaupt, F.m., Geerlings, Paul, De Proft, Frank   +4 more
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