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Your search keyword '"Motoyama, Yukihiro"' showing total 4 results
Start Over Author "Motoyama, Yukihiro" Journal journal of the american chemical society
4 results on '"Motoyama, Yukihiro"'

1. Asymmetric catalysis of Diels-Alder cycloadditions by an MS-free binaphthol-titanium complex: dramatic effect of MS, linear vs positive nonlinear relationship, and synthetic applications

Author

Mikami, Koichi, Motoyama, Yukihiro, and Terada, Masahiro

Subjects
Diels-Alder reaction -- Analysis, Aromatic compounds, Catalysis -- Analysis, Chemistry
Abstract

A binaphthol-titanium complex (BINOL-Ti) catalyzed an asymmetric Diels-Alder (D.-A.) reaction in the absence of molecular sieves (MS). The MS-free complex demonstrated linear relationships with D.-A. products and the ee's of BINOC-Ti and exhibited stability at -20 degrees centigrade for several months.

Published
1994

2. Practical access to amines by platinum-catalyzed reduction of carboxamides with hydrosilanes: synergy of dual Si-H groups leads to high efficiency and selectivity

Author

Hanada, Shiori, Tsutsumi, Emi, Motoyama, Yukihiro, and Nagashima, Hideo

Subjects
Amides -- Chemical properties, Catalysis -- Analysis, Oxidation-reduction reaction -- Analysis, Platinum -- Chemical properties, Siloxanes -- Chemical properties, Chemistry
Abstract

The syntergetic effect of two Si-H groups which leads to efficient platinum-catalyzed reduction of carboxamides to amines under mild conditions is reported. The reduction of amides having other reducible functional groups such as N[O.sub.2], C[O.sub.2]R, CN, C-C, Cl, and Br moieties to provide a reliable method for the access to functionalized amine derivatives is also discussed.

Published
2009

3. Self-encapsulation of homogeneous catalyst species into polymer gel leading to a facile and efficient separation system of amine products in the ru-catalyzed reduction of carboxamides with polymethylhydrosiloxane

Author

Motoyama, Yukihiro, Mitsui, Kaoru, Ishida, Toshiki, and Nagashima, Hideo

Subjects
Carbon compounds -- Chemical properties, Chemical reactions -- Research, Amines -- Chemical properties, Chemistry
Abstract

The present reduction of amides with polymethylhydrosiloxane (PMHS) offers a solution as an environmentally benign production of amines, namely an efficient catalytic process involving facile separation of catalyst species and silicone byproducts from the product. The self-encapsulation of catalyst species into the silicone resin is considered to be one of the methods for microencapsulation of molecular catalysts into polymer supports.

Published
2005

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