Results 241 to 250 of about 133,959 (307)

Tuneable emission from disordered to ordered aggregates in substituted 9,10-dihydroanthracene polymers.

Chem Commun (Camb)
Woering EF, Taddeucci A, Pucci A, Hildner R, Carlotti M.   +4 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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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 ...
Jacques-Emile Dubois, Annick Panaye, John Anthony MacPhee   +2 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
Alan J. Welch, Gillian J. McCormick, Kerry J. Adams, Jill Cowie, Steven G.D. Henderson   +4 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.
J. E. Eilers, A. Greenberg, A. Liberles
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