scholarly journals An Efficient Synthesis of Procyanidins. Rare Earth Metal Lewis Acid Catalyzed Equimolar Condensation of Catechin and Epicatechin.

ChemInform ◽  
2007 ◽  
Vol 38 (48) ◽  
Author(s):  
Yoshihiro Mohri ◽  
Masayoshi Sagehashi ◽  
Taiji Yamada ◽  
Yasunao Hattori ◽  
Keiji Morimura ◽  
...  
Keyword(s):  
Rare Earth ◽  
Lewis Acid ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Efficient Synthesis ◽  
Acid Catalyzed

scholarly journals An efficient synthesis of procyanidins. Rare earth metal Lewis acid catalyzed equimolar condensation of catechin and epicatechin

2007 ◽  
Vol 48 (33) ◽  
pp. 5891-5894 ◽  
Author(s):  
Yoshihiro Mohri ◽  
Masayoshi Sagehashi ◽  
Taiji Yamada ◽  
Yasunao Hattori ◽  
Keiji Morimura ◽  
...  
Keyword(s):  
Rare Earth ◽  
Lewis Acid ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Efficient Synthesis ◽  
Acid Catalyzed

Polymerization and Chiroptical Behavior of Polymethacrylamides Bearing a Bulky Oxazoline Pendant

2014 ◽  
Vol 887-888 ◽  
pp. 688-692
Author(s):  
Zheng Fu ◽  
Hong Wei ◽  
Chao Yuan ◽  
Zhong Wen Li
Keyword(s):  
Rare Earth ◽  
Free Radical ◽  
Radical Polymerization ◽  
Lewis Acid ◽  
Rare Earth Metal ◽  
Lewis Acids ◽  
Earth Metal ◽  
Free Radical Polymerization ◽  
Optically Active ◽  
Circular Dichroïsm

The radical polymerization of optically active methacrylamide derivatives, N-[o-(4-phenyl-4,5-dihydro-1,3-oxazol-2-yl) phenymethacrylamide ((R)-PhOPMAM) and N-[o-(4-isopropyl-4,5-dihydro-1,3-oxazol-2-yl) phenymethacrylamide ((S)-PriOPMAM), were carried out under various conditions. The effect of the Lewis acid, that is, rare earth metal trifluoromethanesulfonates on the free-radical polymerization were examined under different solvents. The Lewis acids are effective in enhancing the isotacticity in the polymerization of (S)-PriOPMAM. The same phenomenon were not happened in the polymerization of (R)-PhOPMAM. The polymerization characteristics and the chiroptical behavior of the resultant polymers have been examined by using circular dichroism (CD), UVVis, and NMR spectroscopies.

Palladium-catalyzed C(sp3)–C(sp2) cross-coupling of homoleptic rare-earth metal trialkyl complexes with aryl bromides: efficient synthesis of functionalized benzyltrimethylsilanes

2016 ◽  
Vol 52 (31) ◽  
pp. 5425-5427 ◽  
Author(s):  
Guilong Cai ◽  
Yingda Huang ◽  
Tingting Du ◽  
Shaowen Zhang ◽  
Bo Yao ◽  
...  
Keyword(s):  
Rare Earth ◽  
Functional Groups ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Cross Coupling ◽  
Efficient Synthesis ◽  
Alkyl Complexes ◽  
Aryl Bromides ◽  
Palladium Catalyzed

The first C(sp3)–C(sp2) cross-coupling of rare-earth metal alkyl complexes with aryl bromides has been developed for an efficient synthesis of benzyltrimethylsilanes with diverse functional groups.

Polymerization and Chiroptical Behavior of N-[o-(4-isopropyl-4,5-dihydro-1,3-oxazol-2-yl) phenyl] Methacrylamide

2013 ◽  
Vol 477-478 ◽  
pp. 1187-1191 ◽  
Author(s):  
Zheng Fu ◽  
Hong Wei ◽  
Yang Ding ◽  
Chao Yuan
Keyword(s):  
Rare Earth ◽  
Circular Dichroism ◽  
Free Radical ◽  
Radical Polymerization ◽  
Lewis Acid ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Free Radical Polymerization ◽  
Optically Active ◽  
Circular Dichroïsm

The radical polymerization of optically active methacrylamide derivative, N-[o-(4-isopropyl-4,5-dihydro -1,3-oxazol-2-yl)phenyl] methacrylamide ((S)-MeOPMAM), was carried out under various conditions. The effect of Lewis acid, that is, rare earth metal trifluoromethanesulfonates on the free-radical polymerization were examined under different solvents. The polymerization in the presence of rare earth metal trifluoromethanesulfonates produced isotactic-rich polymers compared with those obtained without the Lewis acid. The polymerization characteristics and the chiroptical behavior of the resultant polymers have been examined by using circular dichroism (CD), UV–Vis, and NMR spectroscopies.

Half-sandwich rare-earth metal tris(alkyl) ate complexes catalyzed phosphaguanylation reaction of phosphines with carbodiimides: an efficient synthesis of phosphaguanidines

2015 ◽  
Vol 39 (10) ◽  
pp. 7649-7655 ◽  
Author(s):  
Wangyang Ma ◽  
Ling Xu ◽  
Wen-Xiong Zhang ◽  
Zhenfeng Xi
Keyword(s):  
Catalytic Activity ◽  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Efficient Synthesis ◽  
Yttrium Complexes ◽  
Half Sandwich

Half-sandwich Y/Li ate complex displays better catalytic activity for phosphaguanylation reaction of phosphines with carbodiimides than the neutral yttrium complexes.

Strategic Design and Refinement of Lewis Acid–Base Catalysis by Rare-Earth-Metal-Containing Polyoxometalates

2012 ◽  
Vol 51 (12) ◽  
pp. 6953-6961 ◽  
Author(s):  
Kosuke Suzuki ◽  
Midori Sugawa ◽  
Yuji Kikukawa ◽  
Keigo Kamata ◽  
Kazuya Yamaguchi ◽  
...  
Keyword(s):  
Rare Earth ◽  
Lewis Acid ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Base Catalysis ◽  
Acid Base ◽  
Strategic Design
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