Results 271 to 280 of about 264,880 (337)

Enhancing CO₂ Reduction Performance on Cu-Based Catalysts: Modulating Electronic Properties and Molecular Configurations. [PDF]

Materials (Basel)
Han H, Yang L, Han C, Bi M, Li H, Zeng Y, Pan K, Yin S, Wang F, Pan S.   +9 more
europepmc   +1 more source

Enantiotopic-group-selective coupling for unified access to carbazole atropisomers as versatile chiral chromophores. [PDF]

Nat Commun
Wei J, Wang Z, Xing P, Zhu Y.
europepmc   +1 more source

Palladium-catalyzed enantioselective dienylation of propargylic carbonates via sulfonimidamide desymmetrization. [PDF]

Nat Commun
Xu C, Hou J, Chen Y, Zhang L, Zhou C, Chen X, Chen LA.   +6 more
europepmc   +1 more source

Switchable Amination Pathways of Chromones via Iodonium Salt/Amine Modulation. [PDF]

JACS Au
Zhang S, Yang Z, Shi H, Li X, Zhao H, Du Y.   +5 more
europepmc   +1 more source

Structural Basis for D3/D4-Selective Antagonism of Piperazinylalkyl Pyrazole/Isoxazole Analogs. [PDF]

Molecules
Choi KE, Jang SH, Park WK, No KT, Koh HY, Pae AN, Cho NC.   +6 more
europepmc   +1 more source

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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 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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