A cascade process for directly converting nitriles (RCN) to cyanamides (RNHCN) <i>via</i> SO<sub>2</sub>F<sub>2</sub>-activated Tiemann rearrangement
作者:Guofu Zhang、Yiyong Zhao、Chengrong Ding
DOI:10.1039/c9ob01547g
日期:——
practical process for the direct conversion of nitriles to cyanamides was newly discovered and exhibited a wide substrate scope as well as great functional group-tolerability (36 examples). In this efficient strategy, the in situ generated amidoximes obtained from the reaction of nitriles with hydroxylamine subsequently underwent Tiemann rearrangement, producing the corresponding cyanamides with great
Nano Cerium Oxide as a Recyclable Catalyst for the Synthesis of <i>N</i>-Monosubstituted Ureas with the Aid of Acetaldoxime as an effective Water Surrogate
作者:S. Mohammad Sajadi、Mehdi Maham
DOI:10.3184/174751913x13787959859461
日期:2013.10
A new method for the synthesis of N-monosubstituted ureas has been developed by the reaction of cyanamides with acetaldoxime in the presence of nano cerium oxide as an efficient and recyclable catalyst.
Synthesis of N-arylureas in water and their N-arylation with aryl halides using copper nanoparticles loaded on natural Natrolite zeolite under ligand-free conditions
A new method for the synthesis of N-arylureas and their N-arylation with arylhalides has been developed using copper nanoparticles supported on natural Natrolite zeolite as a reusable heterogeneous catalyst underligand-free conditions.
Preparation of novel palladium nanoparticles supported on magnetic iron oxide and their catalytic application in the synthesis of 2-imino-3-phenyl-2,3-dihydrobenzo[<i>d</i>
]oxazol-5-ols
Novel Pd nanoparticles were prepared in five successive stages: 1) preparation of the Fe3O4 magnetic nanoparticles (Fe3O4 MNPs), 2) coating of Fe3O4 MNPs with SiO2 (Fe3O4@SiO2), 3) functionalization of Fe3O4@SiO2 with 3‐chloropropyltrimethoxy‐ silane (CPTMS) ligand (Fe3O4@SiO2@CPTMS), 4) further functionalization with 3,5‐diamino‐1,2,4‐triazole (DAT) ligand (Fe3O4@SiO2@CPTMS @DAT), and 5) the complexation
在五个连续的阶段中制备了新型Pd纳米颗粒:1)制备Fe 3 O 4磁性纳米颗粒(Fe 3 O 4 MNPs),2)用SiO 2(Fe 3 O 4 @SiO 2)涂覆Fe 3 O 4 MNPs。,3)的Fe的官能化3 ö 4 @SiO 2与3- chloropropyltrimethoxy-硅烷(CPTMS)配体(铁3 ö 4 @SiO 2个@CPTMS),4)进一步官能化与3,5-二氨基-1,2,4- ‐三唑(DAT)配体(Fe 3 O 4 @SiO2 @CPTMS @DAT),和5)Fe 3 O 4 @SiO 2 @ CPTMS @ DAT与PdCl 2(Fe 3 O 4 @SiO 2 @ CPTMS @ DAT @ Pd)的络合。然后,通过不同的方法,如元素分析(CHN),FT-IR,XRD,EDX,SEM,TEM,TG-DTA和VSM,对制得的Pd纳米催化剂进行了表征。最后,Pd催化
Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> nanoparticle supported ionic liquid for green synthesis of antibacterially active 1-carbamoyl-1-phenylureas in water
作者:Mahmoud Nasrollahzadeh、Zahra Issaabadi、S. Mohammad Sajadi
DOI:10.1039/c8ra04368j
日期:——
demonstrated in the synthesis of 1-carbamoyl-1-phenylureas with good to excellent yields via a new, simple and one-pot procedure in aqueous media under reflux conditions. This procedure has advantages such as high yields, short reaction times, a simple methodology and work-up process, green reaction conditions, high stability, catalytic activity, and easy preparation, separation and reusability of the catalyst
在目前的工作中,我们设计了一种基于 5-苯基-1 H-四唑的新型、非均相和可回收的磁性 BrønSTed 酸性离子液体。Fe 3 O 4 @SiO 2 @(CH 2 ) 3 5-phenyl-1 H -tetrazole- SO 3 H/Cl} ([FSTEt-SO 3 H]Cl)通过5-苯基- 1小时使用 3-氯丙基三乙氧基硅烷作为连接剂,将 -四唑键合的磺酸连接到二氧化硅包覆的磁性纳米粒子的表面上。通过XRD、TEM、FESEM、EDS、TG-DTA和FT-IR对催化剂进行了表征。这种催化剂的能力和高活性在 1-carbamoyl-1-phenylureas 的合成中得到了证明,通过一种新的、简单的和一锅法在水介质中回流条件下的合成具有良好的产率。该工艺具有收率高、反应时间短、方法和后处理工艺简单、反应条件绿色、稳定性高、催化活性好、催化剂易于制备、分离和重复利用等优点。这些化合物的合成通过