根据可持续发展的要求,在温和条件下从废水中回收精细化学品是一个极其重要的研究方向。构建了低成本、高效的多齿螯合物和聚合物 Co( II ) 基络合物 (Co-L) 负载 C 3 N 4光催化剂 (Co-L/C 3 N 4 ) 并用于转化芳香扁桃酸室温下废水中的酸。BET比表面积从28m 2 g -1增加到68 m 2 g -1,表明其优异的吸收特性。Co-L/C 3 N 4的光吸收范围达到650 nm,而带能降低至2.30 eV,导致光催化活性显着增强。由于Co-L/C 3 N 4的光活性,取代扁桃酸的转化率超过90% 。时间分辨PL光谱表明Co-L/C 3 N 4中光生电子-空穴对的显着分离。此外,紫外可见光谱和原位傅里叶变换红外光谱表明在选择性氧化过程中形成了醛基,这为合理的催化机制提供了支持。
Environmentally Friendly and Highly Efficient Co(OAc)<sub>2</sub>-Catalyzed Aerobic Oxidation to Access 2,6-Di-Electron-Donating Group Substituted 4-Hydroxybenzaldehydes
作者:Jian-An Jiang、Jia-Lei Du、Zhong-Nan Zhang、Jiao-Jiao Zhai、Ya-Fei Ji
DOI:10.1080/00397911.2013.813052
日期:2014.5.19
developed for selectively preparing a series of valuable 2,6-dialkyl-, dialkoxyl-, and alkoxylalkyl-substituted 4-hydroxybenzaldehydes from corresponding 4-cresols in good to excellent yields, using a catalytic system of Co(OAc)2 · 4H2O (1.0 mol%)–NaOH (1.0 equiv)–O2 (1.0 atm) in aqueousethyleneglycol (EG/H2O = 20/1, v/v) at 50 °C. Furthermore, a plausible mechanism was proposed for the direct oxyfunctionalization
Cu(OAc)<sub>2</sub>-catalyzed remote benzylic C(sp<sup>3</sup>)–H oxyfunctionalization for CO formation directed by the hindered para-hydroxyl group with ambient air as the terminal oxidant under ligand- and additive-free conditions
作者:Jian-An Jiang、Cheng Chen、Jian-Gang Huang、Hong-Wei Liu、Song Cao、Ya-Fei Ji
DOI:10.1039/c3gc41946k
日期:——
A hindered para-hydroxyl group-directed remotebenzylicC(sp3)–H oxyfunctionalization has been developed for the straightforward transformation of 2,6-disubstituted 4-cresols, 4-alkylphenols, 4-hydroxybenzyl alcohols and 4-hydroxybenzyl alkyl ethers into various aromatic carbonyl compounds. The ligand- and additive-free Cu(OAc)2-catalyzed atmospheric oxidation mediated by ethylene glycol unlocks a
Magnetic nano-structured cobalt–cobalt oxide/nitrogen-doped carbon material as an efficient catalyst for aerobic oxidation of p -cresols
作者:Cheng Liang、Xuefeng Li、Diefeng Su、Qiyi Ma、Jianyong Mao、Zhirong Chen、Yong Wang、Jia Yao、Haoran Li
DOI:10.1016/j.mcat.2018.05.005
日期:2018.7
preparation of a sequence of valuable p-hydroxybenzaldehydes from corresponding p-cresols, using a new magnetically separable catalyst of nano-structured cobalt–cobalt oxide/nitrogen-doped carbon (CoOx@CN) material. CoOx@CN showed high activity for the 2-methoxy-4-cresol oxidation to vanillin, giving great yield (90%) and with good turnover number (210), as well as other p-cresols in good to great yields. The
已经开发出了一种有效的好氧氧化方法,可以使用一种新型的可磁分离的纳米结构钴-氧化钴/氮掺杂碳(CoO x @CN)材料从相应的对甲酚中选择性制备一系列有价值的对羟基苯甲醛。。CoO x @CN对2-甲氧基-4-甲酚氧化为香兰素具有很高的活性,收率(90%)高,具有良好的周转率(210),以及其他p-甲酚产量高到高。对催化性能进行了研究,并将其与通过扫描电子显微镜(SEM),透射电子显微镜(TEM),X射线衍射(XRD),X射线光电子能谱(XPS),傅里叶测定的结构,化学和磁性相关-变换红外光谱(FT-IR)和振动样品磁力计(VSM)。还研究了碱与底物的摩尔比,催化剂浓度,温度和溶剂对转化率和选择性的影响。研究表明,CoO x具有显着的催化性能@CN可以归因于具有大表面积的活性物种氧化钴,掺杂氮和多孔碳。催化剂的尺寸是催化剂性能的关键因素。催化剂的铁磁性能使它易于通过外部磁场进行再循环,并连
(EN) Aminophosphonates alpha substituted by phenol groups, of formula (I) have lipoprotein(a) lowering activity.(FR) L'invention concerne des aminophosphonates alpha substitués par des groupes phénol, représentés par la formule (I), qui présentent une activité tendant à faire baisser le taux de lipoprotéine (a).