The Juliá-Colonna Asymmetric Epoxidation Reaction of Chalcone Catalyzed by Length Defined Oligo-L-leucine: Importance of theN-Terminal Functional Group and Helical Structure of the Catalyst in the Asymmetric Induction

2000 ◽  
Vol 73 (9) ◽  
pp. 2115-2121 ◽  
Author(s):  
Ryukichi Takagi ◽  
Toshiki Manabe ◽  
Akiko Shiraki ◽  
Arata Yoneshige ◽  
Yoshikazu Hiraga ◽  
...  
Keyword(s):  
Functional Group ◽  
Helical Structure ◽  
Asymmetric Induction ◽  
Asymmetric Epoxidation ◽  
Epoxidation Reaction ◽  
Terminal Functional Group

ChemInform Abstract: Asymmetric Epoxidation of Chromenes Catalyzed by Chiral Pyrrolidine SalenMn(III) Complexes with an Anchored Functional Group.

ChemInform ◽  
2009 ◽  
Vol 40 (5) ◽  
Author(s):  
Xiang Zhang ◽  
Dong-Ping Wang ◽  
Yin-Bao Jia ◽  
Xiao-Bing Lu ◽  
Hui Wang ◽  
...  
Keyword(s):  
Functional Group ◽  
Asymmetric Epoxidation

Facile synthesis of the enantiomers of frontalin

1984 ◽  
Vol 62 (11) ◽  
pp. 2148-2154 ◽  
Author(s):  
B. D. Johnston ◽  
A. C. Oehlschlager
Keyword(s):  
Asymmetric Epoxidation ◽  
Facile Synthesis ◽  
Epoxidation Reaction ◽  
Synthetic Sequence ◽  
Sharpless Asymmetric Epoxidation

S-(−)- and R-(+)-frontalin (1,5-dimethyl-6,8-dioxabicyclo[3.2.1]octane) were prepared from (E)-2-methyl-2,6-heptadiene-1-ol utilizing the Sharpless asymmetric epoxidation reaction to induce chirality. The six-step synthetic sequence proceeded in approximately 50% overall yield and was found to be suitable for the preparation of multi-gram quantities of either enantiomer with ≥ 90% ee.

Hydrophobic Carbon Dots from Aliphatic Compounds with One Terminal Functional Group

2019 ◽  
Vol 123 (36) ◽  
pp. 22447-22456 ◽  
Author(s):  
Keyang Yin ◽  
Dandan Lu ◽  
Liping Wang ◽  
Quanxin Zhang ◽  
Junying Hao ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Functional Group ◽  
Aliphatic Compounds ◽  
Terminal Functional Group

scholarly journals Silica-Polystyrene Nanocomposite Particles Synthesized by Nitroxide-Mediated Polymerization and Their Encapsulation through Miniemulsion Polymerization

2006 ◽  
Vol 2006 ◽  
pp. 1-10 ◽  
Author(s):  
Bérangère Bailly ◽  
Anne-Carole Donnenwirth ◽  
Christèle Bartholome ◽  
Emmanuel Beyou ◽  
Elodie Bourgeat-Lami
Keyword(s):  
Silica Nanoparticles ◽  
Functional Group ◽  
Silica Surface ◽  
Miniemulsion Polymerization ◽  
Molecular Weights ◽  
Transmission Electron ◽  
Shell Particles ◽  
Terminal Functional Group ◽  
Nitroxide Mediated Polymerization

Polystyrene (PS) chains with molecular weights comprised between 8000 and 64000g⋅mol-1and narrow polydispersities were grown from the surface of silica nanoparticles (Aerosil A200 fumed silica and Stöber silica, resp.) through nitroxide-mediated polymerization (NMP). Alkoxyamine initiators based on N-tert-butyl-1-diethylphosphono-2,2-dimethylpropyl nitroxide (DEPN) and carrying a terminal functional group have been synthesized in situ and grafted to the silica surface. The resulting grafted alkoxyamines have been employed to initiate the growth of polystyrene chains from the inorganic surface. The maximum grafting density of the surface-tethered PS chains was estimated and seemed to be limited by initiator confinement at the interface. Then, the PS-grafted Stöber silica nanoparticles were entrapped inside latex particles via miniemulsion polymerization. Transmission electron microscopy indicated the successful formation of silica-polystyrene core-shell particles.

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