Results 131 to 140 of about 76,516 (303)

1,1‐Disubstituted Vinylbromides: Versatile Building Blocks for the Synthesis of Nitrogen‐Containing Heterocycles

European Journal of Organic Chemistry, EarlyView.
1,1‐Disubstituted vinylbromides are key intermediates for constructing nitrogen‐containing heterocycles. This review provides an overview of the synthetic applications of 1,1‐disubstituted vinylbromides and summarizes recent developments in reaction methodologies, mechanistic insights, and the structural diversity of N‐heterocyclic compounds accessible
Anne Westermeyer, Jun Fang, Chonghuo Liu, Guillaume Lefèvre, Gérard Guillamot, Phannarath Phansavath, Virginie Ratovelomanana‐Vidal   +6 more
wiley   +1 more source

Melt block copolymerization of ε-caprolactone and L-lactide [PDF]

, 1997
AB block copolymers of ε-caprolactone and (L)-lactide could be prepared by ring-opening polymerization in the melt at 110°C using stannous octoate as a catalyst and ethanol as an initiator provided ε-caprolactone was polymerized first.
Dijkstra, Pieter J., Feijen, Jan, Hamhuis, Jennie, Veld, Peter J.A. in 't, Velner, Esther M., Witte, P. van de   +5 more
core   +1 more source

Photochemical Decatungstate‐Catalyzed Hydroacylation of Maleimides

European Journal of Organic Chemistry, EarlyView.
A photocatalytic protocol to access substituted succinimides via tetra‐n‐butylammonium decatungstate photocatalysis is reported. This direct radical‐driven hydroacylation of a variety of N‐substituted maleimides shows tolerance to various aldehydes (or alkanes), affording differentially substituted succinimides in high yields. Succinimides constitute a
Manos V. G. Lantzanakis, Naya A. Stini, Christoforos G. Kokotos   +2 more
wiley   +1 more source

Optically Active Sulfoxides from 2(5H)-Furanone and Monoterpene Alcohols: Synthesis, Structure, and Antibacterial Activity

Учёные записки Казанского университета: Серия Естественные науки
A series of optically active 5(S)-(l-bornyloxy)- and 5(S)-(l-menthyloxy)-2(5H)-furanones with an arylthio group at the C(4) position of the γ-lactone ring was synthesized and studied for its oxidation reactions with various reagents. Novel 2(5H)-furanone
A. M. Khabibrakhmanova, R. G. Faizova, D. P. Gerasimova, E. Y. Trizna, O. A. Lodochnikova, A. R. Kayumov, L. Z. Latypova, A. R. Kurbangalieva   +7 more
doaj   +1 more source

Total Synthesis of Novel Oxylipins: Plasmodiophorols A, C, and Epimers

European Journal of Organic Chemistry, EarlyView.
The first total syntheses of plasmodiophorols A and C, recently identified α‐linolenic acid‐derived oxylipins, were achieved from chiral cyclopentafuranone in 12–13 steps. The routes use enzymatic desymmetrization, epimerization, and diastereoselective Grignard addition, providing stereocontrolled access to the natural products and reliable standards ...
Alexandre Guy, Aurélien Lebrun, Thierry Durand, Camille Oger   +3 more
wiley   +1 more source

Constituintes químicos de Vernonia scorpioides (Lam) Pers. (Asteraceae) Chemical constituents of Vernonia scorpioides (Lam) Pers. (Asteraceae)

Química Nova, 2013
The chemical investigation of hexane and ethanol extracts from the aerial parts of Vernonia scorpioides resulted in the isolation and characterization of a new polyacetylene lactone, rel-4-dihydro-4β-hydroxy-5a-octa-2,4,6-triynyl-furan-2-(5H)-one ...
Adalva Lopes Machado, Fabiana Martins Aragão, Paulo N. Bandeira, Hélcio Silva dos Santos, Maria Rose Jane R. Albuquerque, Otília Deusdênia L. Pessoa, Edilberto R. Silveira, Edson Paula Nunes, Raimundo Braz-Filho   +8 more
doaj  

Synthesis of (+)-Marmelo Lacton A and (+)-Marmelo Lactone B [PDF]

Agricultural and Biological Chemistry, 1983
Yoshihiro NISHIDA, Hiroshi OHRUI, Hiroshi MEGURO   +2 more
openaire   +2 more sources

Porcine Liver Esterase‐Catalyzed Dynamic Kinetic Resolution of a Lactone‐Bridged Biaryl: Impact of Organic Cosolvents on Enantioselectivity

European Journal of Organic Chemistry, EarlyView.
A stereolabile lactone‐bridged biaryl enables dynamic kinetic resolution to provide a conformationally stable ring‐opened biaryl. A significant positive effect of water‐immiscible organic cosolvents on the enantioselectivity in a reaction catalyzed by porcine liver esterase has been discovered for the first time.
Neha Dhiman, Anke Hummel, Kyohei Kanomata, Yoshinari Sawama, Tohru Taniguchi, Harald Gröger, Shuji Akai   +6 more
wiley   +1 more source

Emission FTIR analyses of thin microscopic patches of jet fuel residues deposited on heated metal surfaces [PDF]

The relationship of fuel stability to fuel composition and the development of mechanisms for deposit formation were investigated. Fuel deposits reduce heat transfer efficiency and increase resistance to fuel flow and are highly detrimental to aircraft ...
Lauer, J. L., Vogel, P.
core   +1 more source

Memory of Chirality in Radical Addition–Translocation–Cyclization Cascades

Helvetica Chimica Acta, EarlyView.
Radical addition–translocation–cyclization cascades of chiral alkynes show striking memory of chirality (MoC), with strong retention of configuration when fast, polarity favored cyclization are involved. The most effective system employs a highly electron‐poor pentafluorobenzenesulfonyl group.
Christian Simon Gloor, Fabrice Dénès, Valentin Soulard, Philippe Renaud   +3 more
wiley   +1 more source