and since C = O2+is a hard base and Ca2+is a hard acid, C = O2+and Ca2+can be tightly bound, with S moving toward W and combining into new bonds, thus forming an intermediate acid based on the W electronic structure. Li et al[48]explored the potential of Cu-K-Co/AC fordesulfu...
Transition state structureQuantum calculationsMechanistic and kinetic aspects, as well as quantum chemical calculations, for the formation of a tetrahydrofurane ring by cyclization of the highly substituted alcohol–2,6-dimethyl-hept-5-en-2-ol with phenylselenohalides (PhSeCl and PhSeBr), in the ...
aA glycan motif such as Lewisxon surface of different cell types is bound by many different proteins, such as antibodies, lectins, and bacterial toxins.bIllustration of potentially favourable and unfavourable interactions upon deoxyfluorination/deoxygenation.cStructure of Lewisx. d) Depiction of chemo-...
the polymer architectures can be controlled by the structure of the initiator54,55,56,57. Owing to the facile structural tunability of these organophosphorus superbases58,59, we hypothesized that specifically designed bisphosphine superbases could form a FLP with a suitable LA, which ...
Preparation and structure Controlled hydrolysis of B16H20 forms the new borane B14H18. Deuterolysis of B16H20 generates B14H18-xDx. On the basis of the method of synthesis and the 70.6-MHz 11B NMR and the 33.7-MHz 2H NMR spectra of these compounds, a structure fo... S Hermanek,K ...
Structure and extinction of methane and propane nonpremixed counterflow flames at extremely low stretch rates in buoyant flowfields This study experimentally investigated the structures and extinction behaviors of methane-air and propane-air counterflow nonpremixed flames influenced by ... S Tao,J Fang,...
(a) Witte EC, Neubert P, Roesch A (1986) Ger. Offen DE 3427985. Chem Abstr 1986 104: 224915f (b) Wang JL, Liu D, Zhang ZJ, Shan S, Han X, Srinivasula SM, Croce CM, Alnemri ES, Huang Z (2000) Structure-based discovery of an organic compound that binds Bcl-2 protein and ...
The diastereoselectivity of the addition was found to be remarkably sensitive to the structure of the phosphoramide promoter. The results of the uncatalyzed reaction are reiterated to recall a 49/1 selectivity favoring the syn diastereomer. When the reactions are promoted by a catalytic amount of ...
Figure 2: Influence of the catalyst structure on the reactivity and enantioselectivity. Conditions: aldehyde2a(0.05 mmol), TMSCN3(0.1 mmol) and catalyst1(3 mol%) in Et2O (0.16 M) at –30 °C for 4 days unless noted otherwise. Isolated yields were determined after converting...
Synthesis and X-ray structure of the MOFs The ligand (SorR)-3,3′-di-tert-butyl-5,5′-dicarboxyphenyl-6,6′-dimethylbiphenyl-2,2′-diylhydrogen phosphate (H3L) was synthesized by a Pd-catalyzed Suzuki cross-coupling between enantiopure 3,3′-di-tert-butyl-5,5′-dibromo-6,6′-dimethyl...