The bis-1,4-dimesityl-1,2,3-triazol-5-ylidene–palladium complex (1a) successfully catalyzes the Mizoroki–Heck and Sonogashira coupling reactions with aryl bromides to give the corresponding alkenes and alkynes, respectively, in good to excellent yields. In the Mizoroki–Heck reaction, electron-rich, electron-poor, and functionalized aryl bromides and alkenes are tolerated, while the substrates are limited
Ultrasound-assisted C–C coupling reactions catalyzed by unique SPION-A-Pd(EDTA) as a robust nanocatalyst
作者:Marzieh Ghotbinejad、Ahmad R. Khosropour、Iraj Mohammadpoor-Baltork、Majid Moghadam、Shahram Tangestaninejad、Valiollah Mirkhani
DOI:10.1039/c3ra45790g
日期:——
A novel and highly stable Pd(EDTA)2â salt was synthesized as a catalyst, using a counter-cation of N-methylimidazolium bonded to 1,3,5-triazine-tethered SPIONs (superparamagnetic iron oxide nanoparticles). This well-defined complex efficiently catalyzed the MizorokiâHeck and SuzukiâMiyaura cross-coupling reactions. The cross-coupled products were produced under conventional heating and ultrasound irradiation at an extremely low catalyst loading (as low as 0.032 mol% Pd). Results indicated that conventional synthesis took longer and gave moderate yields, while in the presence of ultrasound irradiation, the reaction occurred very fast in high to excellent yields. The catalyst could be quickly recovered by an external magnetic field and could be reused for several reaction cycles without any change in catalytic activity.
SPIONs-bis(NHC)-palladium(II): A novel, powerful and efficient catalyst for Mizoroki–Heck and Suzuki–Miyaura C–C coupling reactions
作者:Marzieh Ghotbinejad、Ahmad R. Khosropour、Iraj Mohammadpoor-Baltork、Majid Moghadam、Shahram Tangestaninejad、Valiollah Mirkhani
DOI:10.1016/j.molcata.2014.01.001
日期:2014.4
Pd-NHC complex utilizing N-methylimidazole bounded to 1,3,5-triazine-tethered SPIONs (superparamagnetic ironoxide nanoparticles) as a bidentate NHC ligand is reported. This well-defined complex was used as an efficient (NHC)-based catalyst for Mizoroki–Heck and Suzuki–Miyaura cross couplingreactions. These cross coupled products were produced in excellent yields under conventional heating or microwave
报道了一种新颖,稳定,功能强大的纳米Pd-NHC络合物,利用N-甲基咪唑与1,3,5-三嗪-拴系的SPIONs(超顺磁性氧化铁纳米颗粒)结合为双齿NHC配体。这种定义明确的络合物用作Mizoroki–Heck和Suzuki–Miyaura交叉偶联反应的高效(NHC)基催化剂。这些交联产物是在常规加热或微波辐射下以极低的钯负载量(〜0.002 mol%)以极高的周转频率(TOFs)(10 3 –10 6 h -1)生产的。而且,该催化剂可以通过外部磁场快速而完全地回收,并且可以重复使用七个反应循环而不会改变催化活性。
Open-air oxidative Mizoroki–Heck reaction of arylsulfonyl hydrazides with alkenes
作者:On Ying Yuen、Chau Ming So、Fuk Yee Kwong
DOI:10.1039/c6ra03188a
日期:——
A palladium(II)-catalyzed oxidative Mizoroki–Heckreaction of arylsulfonyl hydrazides with alkenes was developed employing atmospheric air as the sole oxidant in an open-vessel manner. By using palladium(II) acetate associating with inexpensive, air-stable and moisture stable pyridine ligand L9 as the catalyst system, the efficiency of the reaction could be significantly enhanced. A wide range of arylsulfonyl
Palladium nanoparticles<i>in situ</i>synthesized on<i>Cyclea barbata</i>pectin as a heterogeneous catalyst for Heck coupling in water, the reduction of nitrophenols and alkynes
used as a catalyst for the conversion of alkynes into cis-alkenes with KOH/DMF as a hydrogenation source. The reaction was also utilized effectively for the synthesis of sexpheromones, including Plutella xylostella ((Z)-11-hexadecen-1-yl acetate) and Cylas formicarius ((Z)-3-dodecen-1-yl(E)-2-butenoate) with the total yields of 70% and 68%, respectively. Therefore, PdNPs supported on C. barbata pectin