Polyoxometalate-Intercalated Layered Double Hydroxides as Efficient and Recyclable Bifunctional Catalysts for Cascade Reactions
作者:Kai Liu、Yanqi Xu、Zhixiao Yao、Haralampos N. Miras、Yu-Fei Song
DOI:10.1002/cctc.201501365
日期:2016.3.7
heterogeneous catalysts. However, the application of POM–LDHs as bifunctional catalysts for cascade reaction has seldom been studied compared to the noble‐metal‐based catalysts. Herein, a series of POM–LDHs catalysts of Tris–LDH–X4(PW9)2 (X=Mn, Fe, Co, Ni, Cu, and Zn; Tris=Tris(hydroxymethtyl)aminomethane) have been prepared. The efficacy of Tris–LDH–Zn4(PW9)2 as efficient bifunctional catalyst has been
多金属氧酸盐(POM)插层的双氢氧化物(LDHs)已被广泛用作非均相催化剂。但是,与基于贵金属的催化剂相比,很少研究将POM-LDHs作为双功能催化剂用于级联反应。在此,制备了一系列的Tris–LDH–X 4(PW 9)2(X = Mn,Fe,Co,Ni,Cu和Zn; Tris = Tris(羟甲基)氨基甲烷)POM-LDHs催化剂。Tris–LDH–Zn 4(PW 9)2的功效由于已经证明有效的双功能催化剂用于级联反应,该级联反应包括将苄醇氧化为苯甲醛,然后与氰乙酸乙酯进行Knoevenagel缩合以生成亚苄基氰乙酸乙酯。POM的氧化还原/酸性位点和LDHs的碱性位点的组合导致在温和无碱条件下具有优异活性(99%)和选择性(≥99%)的复合催化剂。这项工作为高效双功能催化剂的制备提供了一种新的设计策略,以促进一锅级联反应。
Photoprotective cosmetic compositions containing aromatic amide, sulphonamide or carbamate derivatives of acrylonitrile and novel aromatic amide, sulphonamide or carbamate derivatives of acrylonitrile
申请人:——
公开号:US20030031691A1
公开(公告)日:2003-02-13
Cosmetic compositions for topical use for protecting the skin and the hair, containing, in a cosmetically acceptable support, at least one compound of formula (1) or (2)
1
in which X
1
represents R
3
—(C═O)—, R
3
—SO
2
— or R
3
—O—(C═O)—, X
2
represents —(C═O)—R′
3
—(C═O)—, —SO
2
—R′
3
—SO
2
— or —(C═O)—O—R′
3
—O—(C═O)—, Y represents —(C═O)—R
4
or —SO
2
R
5
,
R
2
represents a C
1-8
alkyl group, n is 0, 1 or 2, R
3
represents C
1-30
alkyl or C
3-30
alkenyl, R′
3
represents a single bond or a divalent C
1-30
alkylene or C
3-30
alkenylene radical, R
4
represents —OR
6
or —NHR
6
, R
5
represents C
1-30
alkyl or a phenyl nucleus, R
6
represents C
1-30
alkyl or C
3-30
alkenyl, and novel compounds of formula (2)
AMINOARYLVINYL-S-TRIAZINE COMPOUNDS AND USES THEREOF
申请人:Candau Didier
公开号:US20090074820A1
公开(公告)日:2009-03-19
The invention relates to the use of at least one agent for screening out light radiation with a wavelength ranging from 370 to 500 nm as an agent for inhibiting the degradation of endogenous carotenoids present in the skin. The invention is useful for treating skin disorders caused by sunlight (e.g., solar urticaria, actinic dermatitis and pigmentation marks). The invention also relates to novel aminoaryl-vinyl-s-triazine compounds and to the use thereof as agents for screening out light radiation ranging from 370 to 500 nm.