Results 91 to 100 of about 1,953 (209)

beta-Nitroacrylates and silyl enol ethers as key starting materials for the synthesis of polyfunctionalized b-nitro esters and 1,2-oxazine-2-oxides

, 2009
The reaction of silyl enol ethers with b-nitroacrylates, in the presence of tetrabutyl ammonium fluoride as catalyst, allows the formation of polyfunctionalized b-nitro esters, or hexahydro-4H-benzoxazine-2- oxides, depending on the nature of the ...
BOSICA, Giovanna, GABRIELLI, Serena, BALLINI, Roberto, PALMIERI, Alessandro   +3 more
core   +1 more source

POLYFUNCTIONALITY OF ENGLISH QUANTITATIVE WORDS

GISAP:Philological Sciences, 2015
The article in question considers the functioning of quantitative units, their language and speech aspects. The iIntroduction is focused on the most significant items of the reports – definition of numerals, words of weight and measure, aims, methods of investigation, empiric materials applied, evolution modifications and perspectives of further study.
Olha Shumenko, Svitlana Shvachko, Evgeniy Kuprienko   +2 more
openaire   +1 more source

Employing small polyfunctionalized molecules for a diastereoselective synthesis of highly substituted indolines

, 2020
FAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOWe herein have described a straightforward approach for the synthesis of 1,2,3‐trisubstituted indolines by using small ...
Fernandes, Fábio de Souza, Cormanich, Rodrigo A., Coelho, Fernando, Formiga, André Luiz B., Zeoly, Lucas A.   +4 more
core   +1 more source

PRAGMATIC POLYFUNCTIONALITY OF WORDS

the article deals with the analysis of the context determined functional polysemy of discourse markers which help communicators during the processes of discourse generation, actualization and perception. The research is based on Russian and English academic speech and the materials of the National Russian Corpus.
openaire   +1 more source

Facile Assembly of Structurally Diverse 2H-Pyrans Enabled by Chloropalladation-Initiated Carboetherification of Alkenes

Molecules
3,6-Dihydro-2H-pyran heterocyclic framework is one of the currently developed heterocyclic building blocks in both pharmaceutical chemistry and organic synthesis, but with significant challenges.
Fanghua Mao, Bowen Wang, Zhengwang Chen, Yin-Long Lai, Huanfeng Jiang, Jianxiao Li   +5 more
doaj   +1 more source

Synthesis of dihydrophenanthridines by a sequence of Ugi-4CR and palladium-catalyzed intramolecular C-H functionalization

Beilstein Journal of Organic Chemistry, 2008
BackgroundSmall polyfunctionalized heterocyclic compounds play important roles in the drug discovery process and in the isolation and structural identification of biological macromolecules. It is expected that ready access to diverse sets of heterocycles
Florence Bonnaterre, Michèle Bois-Choussy, Jieping Zhu   +2 more
doaj   +1 more source

The polyfunctionality of 'still' expressions

Expressions from the semasiological domain of phasal polarity (ʻstillʼ, ʻalreadyʼ, etc.) tend to be highly polyfunctional, with their various uses often extending into a wide range of other linguistic domains, both time-related and non-temporal. Yet these patterns have hitherto been investigated mostly for individual languages or smaller groups.
openaire   +1 more source

A NOVEL RING TRANSFORMATION OF NITROPYRIMIDINONE LEADING TO POLYFUNCTIONALIZED PYRIDONES

Polyfunctionalized 2-pyridones are readily prepared by the ring transformation using 3-methyl-5-nitropyrimidin-4(3H)-one with active methylene compounds in the presence of ...
MATSUSHIMA, Kazuo, MORIMURA, Hiromi, マツシマ, カズオ, ニシワキ, ナガトシ, モリムラ, ヒロミ, 有賀, 正裕, 西脇, 永敏, NISHIWAKI, Nagatoshi, タムラ, ミナ, 田村, 美奈, アリガ, マサヒロ, TAMURA, Mina, ARIGA, Masahiro   +12 more
core  

Successive Regioselective Metalations of Fused Heterocycles: Synthesis of Polyfunctionalized Furo[3,2‑b]pyridines

, 2016
The furopyridine framework was chosen as a target for a lithiation study, in order to define the most effective conditions leading to the total functionalization of the heterocycle.
Adeline Jasselin-Hinschberger (1950943), Yves Fort (1404295), Corinne Comoy (1950940), Anthony Chartoire (1450696)   +3 more
core   +1 more source

MWCNT-supported Mn–Cu ferrite nanocatalyst for microwave-assisted multicomponent synthesis of polyfunctionalized pyrroles

Carbon Trends
A magnetically recoverable multi-walled carbon nanotube-supported Mn–Cu ferrite nanocomposite (MWCNTs/MnCuFe₂O₄) was developed as an efficient heterogeneous catalyst for the microwave-assisted three-component synthesis of polyfunctionalized pyrroles. The
Kamel A. Saleh, Rahul Saxena, Navin Kumar, Ahmed Aldulaimi, Maha Mohammed Tawfiq, Mariem Alwan, Harvinder Singh Sohal, Reza Mohammadi   +7 more
doaj   +1 more source