开发了一种基于Keggin型多金属氧酸盐的非腐蚀性,可循环利用的高效多相催化剂,即[NMPH] H 3 [SiW 12 O 40 ],用于醇与醇(或烯烃)的直接脱水偶联,以合成各种多取代的烯烃产量高到极好。此外,该反应可以扩大规模,并且该催化剂可以使用七次而不会显着降低活性。动力学竞争实验表明,C–H键的断裂可能参与了速率确定步骤。
Synthesis of internal olefins by direct coupling of alcohols and olefins over Moβ zeolite
作者:Durgaiah Chevella、Arun Kumar Macharla、Srujana Kodumuri、Rammurthy Banothu、Krishna Sai Gajula、Vasu Amrutham、Grigor'eva Nellya Gennadievna、Narender Nama
DOI:10.1016/j.catcom.2019.01.027
日期:2019.4
An efficient and novel Moβ zeolite catalyzed sp2-sp3 CC bond development reaction over the direct coupling of alcohols and alkenes has been performed in solvent free environment. The current method gives an attractive access to a wide variety of polysubstituted alkenes in good to excellent yields. The Moβ zeolite was effectively reused for up to 5 successive cycles.
在无溶剂的环境中,进行了一种有效且新颖的Moβ沸石在醇和烯烃的直接偶联反应中催化的sp 2 -sp 3 C C键发展反应。当前的方法以良好至极好的收率吸引了多种多样的多取代烯烃。Moβ沸石可有效重复使用多达5个连续循环。
Greener approach for the synthesis of substituted alkenes by direct coupling of alcohols with styrenes using recyclable Bronsted acidic [NMP]<sup>+</sup>HSO<sub>4</sub><sup>−</sup> ionic liquid
作者:Kishor V. Wagh、Bhalchandra M. Bhanage
DOI:10.1039/c4ra01324g
日期:——
A green protocol for the synthesis of substituted alkenes from alcohols and styrenes using recyclable [NMP]+HSO4− ionic liquid catalyst with higher atom efficiency has been developed.
Simple and efficient cross coupling of alcohols was developed in the presence of NaHSO4/SiO2 to give the corresponding substituted olefins. Direct coupling of alcohols and alkenes was also achieved to give substituted olefins. NaHSO4/SiO2 could be recycled 7 times without loss of catalytic activity.