Results 11 to 20 of about 75,973 (258)

Utilization of steric hindrance of alkyl lithium-based initiator to synthesize high 1,4 unit-containing hydroxyl- terminated polybutadiene [PDF]

open access: yesRoyal Society Open Science, 2018
A novel alkyl lithium-based initiator with relatively large steric hindrance, tert-butyldimethylsiloxydimethylpropyl lithium (TBDMSODPrLi), was designed and synthesized.
Xin Min, Xiaodong Fan, Jie Liu
doaj   +1 more source

Insights on tert-butyl alkylation effects on fluorobenzene

open access: yesScientific African, 2021
Directing effects of substituents on the benzene ring, ortho and para directors by electron donating groups and meta directors using electron withdrawing groups have been studied and reported widely. In particular and for many years, the directing effect
Lewis Mtashobya
doaj   +1 more source

Observation of 1,3-Diketones Formation in the Reaction of Bulky Acyl Chlorides with Methyllithium

open access: yesMolecules, 2012
The formation of 1,3-diketones was observed in the reactions of bulky acyl chlorides with methyllithium. The reaction products depend on the steric hindrance around the carbonyl group of the acyl chloride and the electronic effect of the group(s) linked ...
Liwen Yang, Nianfa Yang, Jian Zhang
doaj   +1 more source

STRIDER: Steric hindrance estimator [PDF]

open access: yes, 2020
Abstract In silico modeling plays a vital role in the de novo designing and docking of biomacromolecules as well as in exploring their conformational dynamics. Additionally, it has a major role in acquiring the structural insights from the parameters derived from ...
Prasad Patro, L Ponoop   +1 more
openaire   +1 more source

1,9-Bis(2-pyridyl)-1,2,8,9-tetrathia-5-oxanonane

open access: yesMolbank, 2009
Disulfide crosslinking of proteins is typically performed by treating proteins bearing cysteine residues with small-molecule disulfide reagents. The process results in the formation of a mixed disulfide intermediate, which then reacts with the cysteine ...
Jeet Kalia, Ronald T. Raines
doaj   +1 more source

The effect of polyether on the separation of pentlandite and serpentine

open access: yesJournal of Materials Research and Technology, 2015
The effect of polyether on the separation of pentlandite from serpentine has been studied. In addition to flotation and sedimentation tests, electrophoresis and adsorption tests have been conducted.
Xiaowen Zhou, Bo Feng
doaj   +1 more source

UNA PROPUESTA PARA ENSEÑAR EL EFECTO DE LA FORMA DE LAS MOLÉCULAS EN LA REACTIVIDAD QUÍMICA

open access: yesQuímica Nova, 2015
We address the concept of steric effect in the pursuit of establishing quantitative correlations between reactivity of molecules and their molecular shape.
José G. Cermeños-Estrada   +2 more
doaj   +1 more source

Exploring the Mechanism of the Palladium-Catalyzed 3-Butene-2-ol Amination Reaction: A DFT Study

open access: yesFrontiers in Chemistry, 2020
Palladium-catalyzed asymmetric allylic substitution, due to its valuable reactive profile, has become a quite useful tool in organic synthesis fields.
Lingshan Lyu   +4 more
doaj   +1 more source

Full three-dimensional morphology evolution of amorphous thin films for atomic layer deposition

open access: yesAIP Advances, 2018
We introduce a Monte Carlo model based on random deposition and diffusion limited aggregation in order to study the morphological evolution of deposition of nanofilm, which is difficult to carry out by the experimental methods.
Lingpeng Jin   +3 more
doaj   +1 more source

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