申请人:Unilever Home & Personal Care USA, Division of Conopco, Inc.
公开号:US20040019980A1
公开(公告)日:2004-02-05
A hair coloring composition comprising the following two compositions which are mixed just prior to application to the hair:
(a) a composition comprising a water-soluble peroxygen oxidizing agent; and
(b) a composition comprising one or more oxidative hair coloring agents selected from the group consisting of an aromatic diamine, an amino phenol, a naphthol, a polyhydric phenol, a catechol and mixtures thereof; wherein the composition comprising one or more oxidative hair coloring agents further comprises al least one water soluble carbonate releasing salts; and optionally a water soluble ammonium salt,
is described.
Hypoiodite-catalysed oxidative homocoupling of arenols and tandem oxidation/cross-coupling of hydroquinones with arenes
作者:Muhammet Uyanik、Dai Nagata、Kazuaki Ishihara
DOI:10.1039/d1cc05171g
日期:——
We report the hypoiodite-catalyzed oxidative C–C homocoupling of arenols to biarenols or biquinones using aqueous hydrogen peroxide as an oxidant. In addition, by combining hypoiodite catalysis and lipophilic Lewis acid-assisted Brønsted acid catalysis under aqueous conditions, we achieved a tandem oxidation/cross-coupling reaction of hydroquinones with electron-rich arenes. These results highlight
Enhanced color deposition for hair with sequestering agents
申请人:Unilever Home & Personal Care USA, Division of Conopco, Inc.
公开号:US20030135935A1
公开(公告)日:2003-07-24
Hair coloring compositions which comprise:
(A) non-nitrogenous chelating agents from the group consisting of polyphosphate; phosphonates; hydroxycarboxylates; polyacrylates; zeolite; and mixtures thereof;
(B) an oxidative dye primary intermediate; and
(C) an oxidative dye coupler;
(D) and water are described.
The present invention also relates to a method for coloring hair which comprises contacting said hair with a hair coloring composition as described above.
Formal Radical Cyclization onto Benzene Rings: A General Method and Its Use in the Synthesis of <i>e</i><i>nt</i>-Nocardione A
作者:Derrick L. J. Clive、Stephen P. Fletcher、Dazhan Liu
DOI:10.1021/jo030364k
日期:2004.5.1
An indirect method is described for effecting radical cyclization onto a benzene ring. Cross-conjugated dienones 6, which are readily prepared from phenols, undergo radical cyclization (6 → 7 → 8), and the products (8) are easily aromatized. The method has been applied to the synthesis of ent-nocardione A (21).
Formal radical cyclization onto benzene rings—a general method proceeding via cross-conjugated dienones
作者:Derrick L. J. Clive、Stephen P. Fletcher、(in part) Mingzhao Zhu
DOI:10.1039/b212223e
日期:2003.2.7
Cross-conjugated dienones of type 5 (X = I), which are readily available from phenols, undergo radical cyclization (5 â 6 â 7), and the products are easily aromatized (7 â 8), giving substances that are formally derived by radical cyclization onto a benzene ring (cf.eqn. (1)).