Peroxoniobium(<scp>v</scp>)-catalyzed selective oxidation of sulfides with hydrogen peroxide in water: a sustainable approach
作者:Sandhya Rani Gogoi、Jeena Jyoti Boruah、Gargi Sengupta、Gangutri Saikia、Kabirun Ahmed、Kusum K. Bania、Nashreen S. Islam
DOI:10.1039/c4cy00864b
日期:——
Facile and selective transformation of thioethers to the corresponding sulfoxides or sulfones with 30% H2O2 has been achieved in an aqueous medium by using peroxoniobium(v) complexes as reusable catalysts.
Merrifield resin supported peroxomolybdenum(vi) compounds: recoverable heterogeneous catalysts for the efficient, selective and mild oxidation of organic sulfides with H2O2
作者:Jeena Jyoti Boruah、Siva Prasad Das、Seshadri Reddy Ankireddy、Sandhya Rani Gogoi、Nashreen S. Islam
DOI:10.1039/c3gc40304a
日期:——
amino acid functionalized Merrifield resin, which exhibit excellent activity, stability and selectivity for the oxidation of thioethers and dibenzothiophene (DBT) to the corresponding sulfoxides or sulfones by H2O2 at ambient temperature. The synthetic protocols are high-yielding, halogen-free, environmentallyclean and safe, and operationally simple. The catalysts, [MoO2(O2)(L)2]2−-MR [L = valine (MRVMo)
Water-soluble polymer anchored peroxotitanates as environmentally clean and recyclable catalysts for mild and selective oxidation of sulfides with H2O2 in water
作者:Kabirun Ahmed、Gangutri Saikia、Sivangi Paul、Satyajit Dey Baruah、Hiya Talukdar、Mitu Sharma、Nashreen S. Islam
DOI:10.1016/j.tet.2019.130605
日期:2019.11
catalysts of the type [Ti2(O2)2O2(OH)2]4-—L (L = PA or PMA), highly effective in chemoselective sulfoxidation of organicsulfides with 30% H2O2 in aqueous medium at ambient temperature. The catalytic protocol is high yielding (TOF up to 11,280 h−1), operationally simple as well as environmentallyclean and safe, being free from halide, or any other toxic auxiliaries. The catalysts are sufficiently stable to
将过氧钛(pTi)物种固定到线性水溶性丙烯酸基聚合物,聚丙烯酸钠(PA)和聚甲基丙烯酸钠(PMA)上,成功合成了一对新型的耐水和可回收材料[Ti 2(O 2)2 O 2(OH)2 ]类型的催化剂4- L(L = PA或PMA),在水介质中于30%H 2 O 2的有机硫化物的化学选择性硫氧化反应中非常有效环境温度。催化方案高产(TOF可达11,280 h -1),操作简单,环保清洁,安全,不含卤化物或任何其他有毒助剂。催化剂足够稳定,足以为硫氧化的至少10个连续反应循环提供容易的可回收性,并具有一致的活性选择性分布。通过改变反应条件,也可以使用相同的催化剂将二苯并噻吩(DBT)氧化为各自的高纯度亚砜或砜。
Process for Preparing 2,2-Difluoroethylamine
申请人:LUI Norbert
公开号:US20110060167A1
公开(公告)日:2011-03-10
The present invention relates to a process for preparing 2,2-difluoroethylamine proceeding from 2,2-difluoro-1-haloethane using ammonia in a solvent which has a maximum water content of 15% by volume and in the presence of a catalyst which accelerates the reaction with ammonia.
The invention relates to compounds of the general formula (I),
in which the radicals A
1
, A
2
, A
3
, A
4
, Lm, Q, R
1
, T and U have the meaning given in the description and to the use of the compounds for controlling animal pests. In addition, the invention relates to processes and intermediates for the preparation of the compounds according to formula (I).