highly effective C−O coupling reaction of (hetero)aryl electrophiles with primary and secondary alcohols is reported. Catalyzed by a NiII‐arylcomplex under long‐wave UV (390–395 nm) irradiation in the presence of a soluble amine base without any additional photosensitizer, the reaction enables the etherification of aryl bromides and arylchlorides as well as sulfonates with a wide range of primary
据报道,(杂)芳基亲电试剂与伯醇和仲醇的高效C-O偶联反应。在可溶性胺碱的存在下,在没有任何其他光敏剂的情况下,在长波紫外线(390–395 nm)辐射下,由Ni II-芳基络合物催化,该反应可以使芳基溴化物和芳基氯化物以及磺酸盐与多种伯和仲脂族醇,可提供合成上重要的醚。分子内CO偶联也是可能的。该反应似乎通过Ni I -Ni III催化循环进行。
Liquid-crystalline polyurethanes, compositions of said liquid-crystalline polyurethanes, and a device for optical data storage comprising a liquid-crystalline polyurethane
申请人:Akzo Nobel N.V.
公开号:EP0550105A2
公开(公告)日:1993-07-07
The invention relates to a liquid-crystalline polyurethane having a side chain comprising a mesogenic group, giving a clear polyurethane which does not isomerise under the influence of light. Such liquid-crystalline polyurethanes are highly suited to be used for optical data storage. The invention further relates to infrared-sensitive liquid-crystalline polyurethanes and liquid-crystalline polyurethane compositions, films containing said liquid-crystalline polyurethanes or polyurethane compositions, and a device for optical data storage containing said liquid-crystalline polyurethanes or polyurethane compositions.