Results 121 to 130 of about 218,279 (284)

Photocatalyst‐Free Trifluoromethylation of Indolizines Through an Electron Donor–Acceptor Complex

European Journal of Organic Chemistry, EarlyView.
A new photocatalyst‐free pathway for the direct C‐3‐trifluoromethylation of indolizines and imidazo[1,2‐a]pyridines through an electron donor–acceptor (EDA) complex is studied. This regioselective reaction supports a wide range of functional groups, indicating good versatility and robustness.
Corinne Coutant, Konan Jean‐Fabrice Koffi, Lielou Lantigner, Pascal Retailleau, Christian Herrero, Christine Tran, Abdallah Hamze, Sandrine Piguel   +7 more
wiley   +1 more source

Bromination of Alkenes and Related Compounds by Use of Benzyltrimethylammonium Tribromide in Aprotic and Protic Solvents

, 1988
The reaction of alkenes and related compounds (1) with benzyltrimethyl-ammonium tribromide (BTMA Br_3) in aprotic solvents such as dichloromethane and chloroform gave 1, 2-dibromo adducts in fairly good yields.
柿並, 孝明, Fujisaki, Shizuo, 梶返, 昭二, Tashiro, Masashi, 田代, 昌士, Kajigaeshi, Shoji, Kakinami, Takaaki, Moriwaki, Masayuki, 藤崎, 静男   +8 more
core  

Protic N‐Heterocyclic Carbene Ligands in Ruthenium‐Catalyzed Transfer Hydrogenation

Helvetica Chimica Acta, EarlyView.
The activity of ruthenium transfer hydrogenation catalysts is strongly influenced by the number of protic units in the N‐heterocyclic carbene ligand. Doubly protic NH, NH ligands induce slower activity than mono‐protic NH, NMe ligands, while NMe, NMe ligands display the highest activity, suggesting metal‐ligand cooperativity is not beneficial for these
Gianluca Righetti, Georgyi Koidan, Sergiy L. Filimonchuk, Svitlana Shishkina, Aleksandr Kostyuk, Martin Albrecht   +5 more
wiley   +1 more source

Kinetic study of the reaction of tertiary phosphines with acrylic acid in aprotic solvents

, 2020
The kinetics of the reaction of tertiary phosphines with acrylic acid in a series of aprotic solvents was studied by spectrophotometry. The data obtained suggest a stepwise mechanism of interaction including initial formation of zwitterionic intermediate
Sobanov A., Bakhtiyarova Y., Galkin V., Khabibullin A., Salin A., Cherkasov R.   +5 more
core  

Modular Synthesis of C5 Sulfur‐Functionalized Oxazolidinones via Thiol‐Induced Cascade Reactions of Epoxy Carbamates

Journal of the Chinese Chemical Society, EarlyView.
A modular cascade reaction of epoxy carbamates with diverse thiols provides efficient access to C5 sulfide‐functionalized oxazolidinones. Intermolecular nucleophilic epoxide ring opening followed by intramolecular acyl substitution enables simultaneous sulfur installation and oxazolidinone formation.
Cheng‐Kun Lin, Yu‐Jin Huang, Meng‐Hsia Tsai, Yueh‐Ling Huang, Xsing‐Yi Lee, Hui‐Yin Hsu   +5 more
wiley   +1 more source

Leveraging Isomerization of Azo Dyes and Imines for the Facile Synthesis of Oxadiazepines and Related Heterocycles

Journal of Heterocyclic Chemistry, EarlyView.
A robust method for synthesizing substituted oxadiazepines and related heterocycles via intramolecular SNAr is detailed. Under mild conditions, this methodology has been leveraged to afford products of varying electronic and aryl nature in up to 99% yields.
Matthew W. Reeves, Christian A. Guzman, Herbi Yuliantoro, Peng Li, Elizabeth R. Young   +4 more
wiley   +1 more source

Radical anions of substituted nitro- and dinitrobenzenes

Тонкие химические технологии, 2007
This article presents the results obtained by means of polarographic investigation and EPR spectra in a series of substituted nitro- and meta-dinitrobenzenes in aprotic solvents.
V. M. Kazakova, N. E. Minina
doaj  

Conjugation‐Length Dependent Interplay Between Charge Transfer and Locally Excited States in Sequence‐Defined Donor–Acceptor Substituted Oligo(Phenylene Ethynylene)s

Macromolecular Rapid Communications, EarlyView.
Iterative synthesis gives access to sequence‐defined oligo(para‐phenylene ethynylene)s, bridging donor and acceptor units through stepwise extension of the conjugated backbone. Accurate length control enables systematic structure‐property relationship investigations across absorption, emission, and excited‐state dynamics.
Qianyu Cai, Till Paha, Marianne Armbruster, André Jung, Eli Zysman‐Colman, Andreas‐Neil Unterreiner, Michael A. R. Meier   +6 more
wiley   +1 more source

Sulfur‐Rank‐Dependent Dispersion and Precipitation Behavior of Structurally Defined Sulfur‐Containing Polymers

Macromolecular Rapid Communications, EarlyView.
Poly(vinylpyrrolidone) creates a quasi‐stable dispersion copolymerization system that enables direct comparison of the dispersed and precipitated polymer fractions. Structural analysis shows that fractionation correlates more strongly with sulfur rank than with molecular weight, revealing how the number of consecutive sulfur atoms in the polysulfide ...
Takumi Hashimoto, Tomonori Yamawaki, Takumi Yoshida, Riku Sawada, Hitoshi Kasai, Kouki Oka, Takumitsu Kida, Yukiya Kitayama, Hiroyasu Yamaguchi, Yuichiro Kobayashi   +9 more
wiley   +1 more source

Tropolone-triethylamine equilibria in various solvents

, 1980
Infrared and nuclear magnetic resonance spectroscopic methods were used to study the tropolonetriethylamine equilibria. In aprotic solvents tropolone transfers its proton to triethylamine to form an ion pair which is in equilibrium with the ...
H Siow, B Poh
core   +1 more source