Results 221 to 230 of about 2,531,644 (304)

Adapting Bower's intramolecular aziridination reaction allows for a metal-free synthesis of N-H aziridines.

Org Biomol Chem
Silver R, Kelley SP, Sathyamoorthi S.
europepmc   +1 more source

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Polynitrogen chemistry enters the ring

Science, 2017
A cyclo -N 5 − anion has been synthesized as a stable salt and characterized
K. Christe
openaire   +3 more sources

Small ring chemistry in crop protection

Tetrahedron, 2019
Abstract An overview is given of the significance of three- and four-membered rings in crop protection chemistry. The main herbicidally, fungicidally, and insecticidally active small ring derivatives are presented, together with their synthesis routes, modes of action and biological efficacies.
C. Lamberth
openaire   +2 more sources

Equilibria in Organo Antimony Ring Chemistry

Phosphorus, Sulfur, and Silicon and the Related Elements, 1992
Abstract Reactions of ethyl antimony and n-propyl antimony rings give equilibria with the mixed substituted derivatives R(n-m)R′mSbn (n = 4, m=1-3; n=5, m=1-4; R=Et, R′= n-Pr). The equilibrium constant K = [(EtSb)4]5/[(EtSb)5]4 has been determined as K = 9.10−8 mol/l. Air oxidation of p-TolSb(SiMeo3)2 gives yellow crystals of p-tolylantimony.
H. J. Breunig, S Gülec, R. Kaller
semanticscholar   +3 more sources

1-Azirine Ring Chemistry

HETEROCYCLES, 1977
Vasu Nair, Ki Hyup Kim
openaire   +2 more sources

Intermolecular interaction characteristics of the all-carboatomic ring, cyclo[18]carbon: Focusing on molecular adsorption and stacking

Carbon, 2021
Recently, an intriguing all-carboatomic ring, cyclo[18]carbon, was observed in the condensed phase for the first time, and it quickly attracted widespread attention.
Zeyu Liu, T. Lu, Qinxue Chen
semanticscholar   +1 more source

Dearomative ring expansion of thiophenes by bicyclobutane insertion

Science, 2023
Skeletal ring enlargement is gaining renewed interest in synthetic chemistry and has recently focused on insertion of one or two atoms. Strategies for heterocyclic expansion through small-ring insertion remain elusive, although they would lead to the ...
Huamin Wang, Huiling Shao, Ankita Das, Subhabrata Dutta, Hok Tsun Chan, C. Daniliuc, K. Houk, F. Glorius   +7 more
semanticscholar   +1 more source