2018年1月29日 · Today we’ll describe the two main patterns by which various substituents “ direct ” electrophilic aromatic substitution. In one pattern, substituents direct the reaction to give either the “ ortho ” (1,2) or “ para ” product, with a slight preference for “para” (1,4).

2017年9月26日 · The rate of electrophilic aromatic substitution (EAS) reactions is greatly affected by the groups attached to the ring. The more electron-rich the aromatic ring, the faster the reaction Groups that can donate electron density to the ring make EAS reactions faster.

2018年4月18日 · How do we install Cl, Br, or I on an aromatic ring? You may recall that alkenes react readily with Cl 2, Br 2, and I 2 to form dihalides. Benzene? Not so much. And when it does react with aromatic rings, it provides substitution rather than addition products. [Why?

Breas Medical is a leading manufacturer of medical equipment for respiratory care and sleep apnea treatment. We develop and produce high-quality products that improve the quality of life for patients with respiratory problems and their caregivers.

Bromide (Br⊖), from FeBr 4－ then acts as a base removing a proton from the ring to form a p-bond and reestablishing aromaticity. This overall process is referred to as an electrophilic aromatic substitution (EAS) because a hydrogen on the aromatic ring is substituted with an electrophile, such as Br. (Figure 3) Figure 3.

Para prosseguir, informe seus dados: Entrar. Entrar com Google Institucional

"A EAS Brasil Representações atua como intermediária estratégica entre clientes e fornecedores, oferecendo consultoria comercial, suporte e uma vasta experiência no mercado. Com foco em múltiplos setores, nossa missão é criar parcerias de sucesso, adaptando soluções para cada necessidade de negócio.

Agora, adotamos o login através das credenciais do Office. Para entrar, insira seu CPF e você será automaticamente direcionado para concluir o processo de autenticação (caso ainda não tenha realizado). Se você possui mais de uma matrícula na instituição, acesse o link (Tenho mais de uma matrícula) na tela inicial de login para continuar seu acesso.

Estaleiro Atlântico Sul (EAS) is a Brazilian shipbuilding company. Estaleiro Atlântico was founded in 2005 by Samsung Heavy Industries, construction groups Grupo Camargo Corrêa and Grupo Queiroz Galvão in response to growing demand in the shipbuilding market in Brazil.

亲电芳香取代（eas）是有机化学中最基本的反应之一。使用定向外部电场（oeef）代替传统试剂来调节 eas 反应活性可以提供一种环境友好的方法来合成芳香族化合物，并有望扩大其范围。