Importance of C−N Bond Rotation in <i>N</i>-Acyl Oxazolidinones in their SmI<sub>2</sub>-Promoted Coupling to Acrylamides
作者:Rolf H. Taaning、Karl B. Lindsay、Birgit Schiøtt、Kim Daasbjerg、Troels Skrydstrup
DOI:10.1021/ja903401y
日期:2009.7.29
correlates with the activation barriers for C-N bond rotation may have implications for other useful synthetic organic reactions involving similar substrates. Finally, these studies were extrapolated to understanding the poor reactivity of N-acyl oxazolidinones, as those derived from Evans chiral auxiliaries, with N-tert-butyl acrylamide. These couplings appear to be dominated by the activation energy for addition
The invention relates to novel cyclic and open-chain hydroxylamine esters and polymerizable compositions comprising these hydroxylamine esters and an ethylenically unsaturated monomer or oligomer. The invention also relates to use as polymerization initiators and to the use of known hydroxylamine esters selected from the group consisting of HALS compounds and the novel hydroxylamine esters for the controlled degradation of polypropylene and for achieving a controlled increase in the molecular weight of polyethylene.
DYEING COMPOSITION, DYED PRODUCT, AND AZO COLORING AGENT
申请人:FUJIFILM Corporation
公开号:US20200354576A1
公开(公告)日:2020-11-12
Provided are a dyeing composition which contains an azo coloring agent represented by Formula 1 or 2, a dyed product which is obtained by being dyed with the dyeing composition, and a novel azo coloring agent. In Formulae 1 and 2, C
1
represents a heteroaromatic group, A
1
and B
1
each independently represent a heteroaromatic group, an aromatic group, or a group having a methine structure, and at least one of A
1
or B
1
represents a heteroaromatic group, D
1
represents an anthraquinonyl group, and E
1
represents a heteroaromatic group, an aromatic group, or a group having a methine structure.
A
1
-N═N—C
1
—N═N—B
1
Formula 1
D
1
-N═N-E
1
Formula 2
The present invention is directed to a hair dyeing composition comprising an azo dye of the following general formula (I)A - N = N - B where A = monovalent, optionally substituted heterocyclic group binding via the carbon atom to the azo group, that does not contain carboxy (-CO2H) or sulfo groups (SO3H) or quaternary ammonium groups and B = heterocyclic, aromatic or alkyl group containing a dissociative proton and, which is free of carboxy (-CO2H) or sulfo groups (-SO3H) or quaternary ammonium groups.
Additionally, the present invention describes a method of dyeing human or animal hair by using such a dye and the use of this direct azo dye for dyeing human or animal hair. The use of this direct azo dye can impart the hair with an extremely vivid colour and has a less colour fade over the time.
本发明涉及一种染发组合物,包括以下通用式(I)A - N = N - B的偶氮染料,其中A = 通过碳原子与偶氮基结合的一价的、可选地取代的杂环基团,不含羧基(-CO2H)或磺酸基(SO3H)或季铵基团;B = 含有可解离质子的杂环、芳香或烷基团,且不含羧基(-CO2H)或磺酸基(-SO3H)或季铵基团。此外,本发明描述了一种通过使用这种染料来染色人类或动物头发的方法,以及使用这种直接偶氮染料来染色人类或动物头发。使用这种直接偶氮染料可以使头发呈现极为鲜艳的颜色,并且随着时间的推移,颜色褪色较少。
Process for the controlled increase in the molecular weight of polyethylenes
申请人:Roth Michael
公开号:US20060128903A1
公开(公告)日:2006-06-15
The invention relates to novel cyclic hydroxylamine esters and to the use of known hydroxylamine esters selected from the group consisting of HALS (sterically hindered amine) compounds and the novel hydroxylamine esters achieving a controlled increase in the molecular weight of polyethylene.