Results 61 to 70 of about 596,435 (207)

Bioorthogonal metal-free click-ligation of cRGD-pentapeptide to alginate [PDF]

, 2012
Click reactions have become very common and powerful ligation techniques, of which 1,3-dipolar cycloadditions have most frequently been employed. Since metal-mediated cycloadditions are incompatible in biomedical applications due to toxicity issues ...
Dräger, Gerald, Kirschning, Andreas, Krause, Andreas   +2 more
core   +2 more sources

3D graphene paper-based tandem metal-free thin-film supercapacitors with integrated 200 V output

International Journal of Extreme Manufacturing
The development of high-voltage tandem thin-film supercapacitors (TFSCs) has been limited by the issues such as expensive electrode materials, indispensable commercial separators and metal current collectors, and complex manufacturing processes.
Huilong Liu, Litian Gan, Renji Chen, Zhiwen Xiao, Yun Chen, Hongzuo Yang, Yahang Liu, Baisheng Wu, Ching-Ping Wong, Xin Chen   +9 more
doaj   +1 more source

Gravitational fragmentation in turbulent primordial gas and the initial mass function of Population III stars [PDF]

, 2010
We report results from numerical simulations of star formation in the early universe that focus on the dynamical behavior of metal-free gas under different initial and environmental conditions.
Bromm, Volker, Clark, Paul C., Glover, Simon C. O., Klessen, Ralf S.   +3 more
core   +2 more sources

METAL FREE PROSTHODONTICS

annals and essences of dentistry, 2011
Metal free or All –ceramic restorations are the term for restorations consisting solely of ceramics without any metal support. They are highly esthetic.
openaire   +1 more source

Covalent Organic Frameworks with Molecular Electronic Modulation as Metal‐Free Electrocatalysts for Efficient Hydrogen Peroxide Production

Small Structures, 2023
Tuning the electronic property of active center to balance the adsorption ability and reactivity of oxygen is essential for achieving 2e− oxygen reduction reaction (ORR) for electrocatalytic synthesis of hydrogen peroxide (H2O2), still represents a grand
Shaoda Huang, Shuanglong Lu, Yiming Hu, Yongyong Cao, Yang Li, Fang Duan, Han Zhu, Yinghua Jin, Mingliang Du, Wei Zhang   +9 more
doaj   +1 more source

Metal‐Free Intermolecular Aminoarylation of Alkynes

Angewandte Chemie, 2017
AbstractA metal‐free aminoarylation of internal alkynes is described, yielding tetrasubstituted enaminoates. The transformation proceeds in good to excellent yields through a tandem conjugate addition/Smiles rearrangement involving aryl and heteroaryl sulfonamides.
Pauline T. G. Rabet, Scott Boyd, Michael F. Greaney   +2 more
openaire   +4 more sources

Metal-Free Flat Lens Using Negative Refraction by Nonlinear Four-wave Mixing

, 2014
A perfect lens with unlimited resolution has always posed a challenge to both theoretical and experimental physicists. Recent developments in optical meta-materials promise an attractive approach towards perfect lenses using negative refraction to ...
Cao, Jianjun, Chen, Xianfeng, Feng, Yaming, Wan, Wenjie, Zheng, Yuanlin   +4 more
core   +1 more source

DABCO- and DBU-promoted one-pot reaction of N-sulfonyl ketimines with Morita–Baylis–Hillman carbonates: a sequential approach to (2-hydroxyaryl)nicotinate derivatives

Beilstein Journal of Organic Chemistry, 2018
An intriguing DABCO-catalyzed and DBU-promoted one-pot synthesis of an important class of (2-hydroxyaryl)pyridine derivatives bearing a carboxylate or a nitrile group suitably placed at C3 position of the aza-ring has been achieved in acceptable chemical
Soumitra Guin, Raman Gupta, Debashis Majee, Sampak Samanta   +3 more
doaj   +1 more source

Sustainable, Oxidative, and Metal‐Free Annulation

Chemistry – A European Journal, 2017
AbstractAnnulation has received steadily growing interest in the interplay with the increasing emphasis towards selective C−H bond functionalization reactions. Metal‐free oxidative annulation through functionalization of inert and abundant C−H bonds offers great improvements in terms of atom‐ and step‐economics as well as reduced waste production under
Luis Bering, Srimanta Manna, Andrey P. Antonchick   +2 more
openaire   +4 more sources

Persulfate-Promoted Carbamoylation/Cyclization of Alkenes: Synthesis of Amide-Containing Quinazolinones

Molecules
The incorporation of amide groups into biologically active molecules has been proven to be an efficient strategy for drug design and discovery. In this study, we present a simple and practical method for the synthesis of amide-containing quinazolin-4(3H)-
Jia-Jun Tang, Meng-Yang Zhao, Ying-Jun Lin, Li-Hua Yang, Long-Yong Xie   +4 more
doaj   +1 more source