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Metallocene catalysis is widely used in transformations of unsaturated organic compounds, including the bulk industrial synthesis of polyolefins. Over the last few decades, the electronic and structural properties of their η 5 ‐coordinated ligands have been modified by introducing electron‐donating, electron‐withdrawing, and sterically hindered substituents to obtain desirable catalytic properties for the metallocenes. An efficient way to design η 5 ‐coordinated ligands is to exploit the annelation of heterocyclic fragments with a cyclopentadiene ring. In the present review, we summarize, systematize, and analyze synthetic approaches to heterocycle‐fused cyclopentadienes suitable for metallocene catalyst preparation. 1 Introduction. 2 Pyridi.
RosBusiness (Russian) 04/10/2020 09:14
В Калининградской области зарегистрировали первый случай смерти пациента с коронавирусом. Об этом сообщил лава области Антон Алиханов, передает РБК Калининград. Это был мужчина 1950 года рождения ...
Excelsior (Mexico) 04/10/2020 09:14
Jorge González. CIUDAD DE MÉXICO. Una fuerte fuga de agua se registra la mañana de este viernes en la colonia Tlaxpana en la alcaldía Miguel Hidalgo. Vecinos de la zona dieron aviso al número de emergencias 911, de que se estaban desperdiciando cientos de litros de agua potable. Los hechos se registran en la calle Tonatzin y Atzayacatl justo a un costado del Mercado Anáhuac. En el lugar se encuentran elementos del Heroico Cuerpo de Bomberos para buscar la válvula de paso, sin embargo, hasta el momento no han podido ubicar la llave. Aparentemente se observa que por la fuerza con la que brota el agua, podría tratarse de una línea principal. Se espera la llegada de personal del Sistema de Aguas de la Ciudad de México o de obras de la alcaldía M.
Guardian (United Kingdom) 04/10/2020 09:13
France and Netherlands at odds on finance ministers’ €500bn compromise. France and the Netherlands have openly clashed over the meaning of a which has unlocked a €500bn (£438bn) pandemic rescue package for European economies but left major issues unresolved. Hours after a breakthrough was secured late on Thursday evening to allow immediate support for businesses and healthcare systems, it became clear on Friday that there remained over the longer-term task of rebuilding the European economy.
Rossiyskaya Gazeta (Russia) 04/10/2020 09:13
Пандемия даст серьезный импульс развитию онлайн-услуг юристов, заявил министр юстиции Константин Чуйченко. "Фактически на наших глазах возникают новые правовые институты, целые отрасли регулирования", - добавил он.

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