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Версия для печати | Главная > Центр > Научные советы > Научный совет по катализу > ... > 2004 год > № 30

№ 30

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СОДЕРЖАНИЕ

В.Н. Пармон. Кирилл Ильич Замараев

Л.А. Замараева. Мои воспоминания

Г.И. Скубневская. 40 лет в науке с тобой и без тебя

Мемориальная комната академика Кирилла Ильича Замараева

Программа мемориального семинара
"Физические методы для каталитических исследований
на молекулярном уровне".

П. Федотов. Россия и ИЮПАК.

За рубежом




В.Н. Пармон. Кирилл Ильич Замараев

Подробнее


Л.А. Замараева. Мои воспоминания

Подробнее


Г.И. Скубневская. 40 лет в науке с тобой и без тебя

Подробнее


Мемориальная комната академика Кирилла Ильича Замараева

Подробнее


Программа мемориального семинара

Подробнее


П. Федотов. Россия и ИЮПАК.

Подробнее


За рубежом

New route for catalytic C=C bond cleavage

Alkynes are highly energetic species, and in catalytic reactions they normally couple with other molecules to give complex compounds via cleavage of one or two ( bonds. However, most studies on alkyne C(C bond cleavage have focused on stoichiometric organometallic reactions. And the few studies that have focused on catalytic reactions have required organic promoters such as 2-aminopyridine or 2-aminophenol to facilitate alkyne cleavage. Chemistry professor Rai-Shung Liu and coworkers at National Tsing-Hua University in Taiwan, now report a ruthenium-catalyzed method that splits terminal ethynylalcohols attached to a variety of alkyl and aryl substrates into terminal alkenes and GO without organic promoters [J. Am. Chem. Soc., 125, 9294 (2003)]. The best results were achieved with a tris(pyrazolyl)-borate ruthenium complex in toluene using lithium triflate as a Lewis acid cocatalyst. The researchers used isotopic labeling studies to elucidate a proposed mechanism that includes generation of a metal-vinylidene intermediate. They are using their findings to develop new catalytic processes.

Polyurethane orders zeolites

By using uniformly aligned polyurethane films as templates, chemistry professor Kyung Byung Yoon and coworkers at Sogang University, Seoul, South Korea, can control the synthesis of multicrystal arrays of cilicalite-1, a type of zeolite [Science, 301, 818 (2003)]. The researchers also found that they can change crystal orientation by varying the type of polyurethane film used. The majority of silicalite-l crystals Yoon's group grew on one type of polymer-coated glass were oriented with their smallest surface touching the glass and their larger surfaces touching one another (shown) в not unlike standing eggs on end. In contrast, silicalite-1 crystals grown on bare glass plates were oriented with their largest surface contacting the glass. When Yoon's team altered the basicity of the gel used to apply the polyurethane film, they were able to grow arrays of crystals of different shapes and sizes. They hope these results will lead to applications for zeolites in innovative materials and devices.

C&EN / AUGUST 11.  2003 21



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