Results 11 to 20 of about 89,695 (313)

Facile synthesis of calabash-shaped and twin-tail tadpole-shaped copolymers via photothermal-induced topological transformation

open access: yesGiant, 2023
Rational design of architecture-transformable polymers with dynamic covalent bonds allows to form multiple ring-bearing analogues and gain insight into topology-tunable physicochemical properties.
Zhigang Wang, Yong Lin, Youliang Zhao
doaj   +1 more source

The radical of a non-associative ring [PDF]

open access: yesProceedings of the American Mathematical Society, 1950
In this paper a definition is proposed for the radical of a non-associative ring. Our results are somewhat similar to those given for algebras by Albert in [3],1 but the difficulties that arose in the earlier theory from absolute divisors of zero have been overcome. With slight modifications, the present proofs are applicable to algebras.
openaire   +2 more sources

Recent advances using cyclopropanols and cyclobutanols in ring-opening asymmetric synthesis

open access: yesGreen Synthesis and Catalysis, 2022
Due to high ring strain energies, cyclopropanols and cyclobutanols have a strong tendency of breaking the endocyclic C–C bonds to participate in versatile organic transformations.
Hong Yan, Gregory S. Smith, Fen-Er Chen
doaj   +1 more source

On a problem of Bertram Yood

open access: yesTopological Algebra and its Applications, 2014
In 1964, Bertram Yood posed the following problem: whether the intersection of all closed maximal regular left ideals of a topological ring coincides with the intersection of all closed maximal regular right ideals of this ring.
Abel Mart, Abel Mati
doaj   +1 more source

Visible Light-driven Photocatalytic Synthesis of Medium-sized Lactams with Graphitic Carbon Nitride as Catalyst

open access: yesTaiyuan Ligong Daxue xuebao, 2022
Medium-sized ring lactams have been found as key structures in various bioactive molecules, and they are of vital importance in natural or pharmaceutical molecule synthesis.
Xin CUI   +3 more
doaj   +1 more source

6-Endo-dig cyclization: Flexible enforce to develop synthetic route in organic syntheses

open access: yesResults in Chemistry, 2023
The organic ring closure reaction of diverse acyclic compounds is governed mostly by the Baldwin rule. The ring closure compounds shows emergent application.
Vembu Yogeshwaran   +3 more
doaj   +1 more source

On the left strongly prime modules and their radicals

open access: yesLietuvos Matematikos Rinkinys, 2010
We give the new results on the theory of the one-sided (left) strongly prime modules and their strongly prime radicals. Particularly, the conceptually new and short proof of the A.L.Rosenberg’s theorem about one-sided strongly prime radical of the ring ...
Algirdas Kaučikas
doaj   +1 more source

Effect of Side Chain Functional Groups on the DPPH Radical Scavenging Activity of Bisabolane-Type Phenols

open access: yesAntioxidants, 2019
Methods for improving the antioxidant activity of phenolic compounds have been widely investigated; however, most studies have focused on the structure–activity correlations of substituents on the aromatic rings of catechols or flavonoids.
Kazuya Ichikawa   +3 more
doaj   +1 more source

A characterization of the nil radical of a ring [PDF]

open access: yesPacific Journal of Mathematics, 1970
It is shown that all primitive ideals are of the form p = P(Γ, S, ψ) and that a ring R is nil if and only if it has no prime ideals of the form P = P(Γ9 S, ψ). It is shown that the nil radical of any ring is the intersection of ail prime ideals P = P(Γ, S, φ).
openaire   +2 more sources

Kurosh-Amitsur Right Jacobson Radical of Type 0 for Right Near-Rings

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 2008
By a near-ring we mean a right near-ring. J0r, the right Jacobson radical of type 0, was introduced for near-rings by the first and second authors. In this paper properties of the radical J0r are studied. It is shown that J0r is a Kurosh-Amitsur radical
Ravi Srinivasa Rao   +2 more
doaj   +1 more source

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