6286-30-2Relevant articles and documents
Sudborough, J. J.,Thomas, J.
, p. 715 (1910)
Synthesis method of o-Dibromo compound
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Paragraph 0042-0051, (2022/01/04)
The present invention discloses a synthesis method of o-dibromo compounds, said synthesis method comprising the following steps: preparation of olefins, brominated salts and a mixed solution of bromate; to the mixed solution of dropwise addition of hydrochloric acid solution for reaction; to the end of the reaction, the extraction of o-dibromo compounds in the reaction product; the synthesis method to inexpensive brominated salts (industrial or recycled brominated salts) and bromate as a bromine source, enhance the full use of applicable resources; after the end of the reaction after a simple filtration treatment to obtain a sufficient purity of the product, It can reduce production costs; at the same time, facilitate the transportation and storage of raw materials, and improve the working environment. The synthesis method of the present invention is simple and easy to operate, high safety, small pollution, simple post-treatment, low production cost, product yield and purity can meet the production needs, is both cost advantages and safety and environmental advantages of the industrializable process.
Stable and Highly Regioselective Anionic Polymerization of (Z)-1-Phenyl[3]dendralene
Miya, Masamitsu,Takagi, Tsukasa,Takenaka, Katsuhiko,Toda, Tomoyuki
, p. 4326 - 4332 (2021/05/29)
The anionic polymerization of (Z)-1-phenyl[3]dendralene (1Z-P3D) in THF with potassium naphthalenide (K-Naph) as an initiator was investigated. At -78 °C, a polymer of predictable molecular weight and narrow molecular-weight distribution (Mw/Mn = 1.26) was obtained quantitively in 24 h. The active chain-end carbanion derived from 1Z-P3D was significantly stabilized by conjugation with a phenyl substituent at the C1 position of the monomer; side reactions such as nucleophilic addition to the double bond in other polymer main chains were not observed over a wide temperature range (-78-0 °C). The microstructure of the obtained poly(1Z-P3D) contained a predominant amount of the 1,4 structure (>90%). Thus, the polymerizability of 1Z-P3D was different from that of previously reported 2-phenyl[3]dendralene (P3D), in terms of the nucleophilicity of the active chain end and regioselectivity in the propagation reaction.
