DERIVATIVE OF NOVEL POLYHYDROXY AROMATIC COMPOUND AND USE THEREOF
申请人:RNS CO.,LTD.
公开号:US20150283051A1
公开(公告)日:2015-10-08
Provided is a skin whitening composition with excellent whitening effects, specifically, a derivative or a polyhydroxy cyclic compound represented by Formula I or a pharmacologically acceptable salt thereof, comprising;
wherein
is derived from an aromatic cyclic compound, C
n
, C
n+1
and C
n+2
are three neighboring carbon atoms present in the aromatic cyclic compound, wherein n is a positive integer, R
1
and R
2
are each a saturated or unsaturated straight or branched alkyl or acyl group having 3 to 12 carbon atoms, and R
3
, R
4
, R
5
and R
6
are each independently at least one substituent selected from hydrogen, alkyl, alkoxy, acyloxy, acyloxymethyl, oxo, hydroxy, vinyl, nitrile, carboxaldehyde, carbonitrile and aldehyde.
Looking for the Origin of Allosteric Cooperativity in Metallopolymers
作者:Lucille Babel、Thi Nhu Y Hoang、Laure Guénée、Céline Besnard、Tomasz A. Wesolowski、Marie Humbert-Droz、Claude Piguet
DOI:10.1002/chem.201600857
日期:2016.6.6
concept of allostericcooperativity used in biology, chemistry and physics states that any change in the intermolecular host–guest interactions operating in multisite receptors can be assigned to intersite interactions. Using lanthanide metals as guests and linear multi‐tridentate linear oligomers of variable lengths and geometries as hosts, this work shows that the quantitative modeling of metal loadings
Catalytic Cleavage and Reformation of Ethereal σ-Bonds
作者:Masahito Murai、Kazuki Origuchi、Kazuhiko Takai
DOI:10.1246/cl.180361
日期:2018.7.5
Ether-exchange reaction of alkyl aryl ethers with alcohols and thiols via the cleavage of the C(sp2)–O bond is described. Bi(OTf)3 was found to be a most effective catalyst, and etherification of fused-aromatic ethers proceeded efficiently. Monitoring of reactions revealed conceptually new transetherification between two different ethers, which can be regarded as single-bond metathesis under the same
Suzuki-Miyaura coupling polymerization of p-dibromophenylene and m-phenylenediboronic acid ester, as well as m-dibromophenylene and p-phenylenediboronic acid ester, and the combination of two meta-phenylene monomers, in the presence of t-Bu3PPd(0) catalyst...
Process for making triazine UV absorbers using lewis acids and reaction promoters
申请人:CYTEC Technologies Corp.
公开号:US20010020094A1
公开(公告)日:2001-09-06
It has been now surprisingly discovered after extensive research that 2-halo-4,6-bisaryl-1,3,5-triazine can be prepared with unprecedented selectivity, efficiency, mild conditions, and in high yield by the reaction of cyanuric halide with aromatics in the presence of at least one Lewis acid and at least one reaction promoter. This reaction is also unprecedently general as a variety of aromatics can be used to produce a wide selection of 2-halo-4,6-bisaryl-1,3,5-triazines. The novel approach includes the use of the reaction promoters in combination with at least one Lewis acid under certain reaction conditions to promote the formation of 2-halo-4,6-bisaryl-1,3,5-triazine compounds from cyanuric halide. Preferably, the Lewis acids and reaction promoters are combined to form a complex. 2-Halo-4,6-bisaryl-1,3,5-triazines are key intermediates for making 2-(2-oxyaryl)-4,6-bisaryl-1,3,5-triazine class of UV absorbers.