本发明提供了一种体积中值直径不超过100纳米的O/W型乳液,其含有由式(1)表示的化合物,
其中X
a
和X
b
分别独立地为X
1
、X
2
或1,4-哌嗪二基基团;
s为1或2,
R
4
为具有1-6个碳原子的烷基基团,
n
a
和n
b
分别独立地为0或1,
R
1a
、R
1b
、R
2a
和R
2b
分别独立地为具有1-6个碳原子的烷基基团,
Y
a
和Y
b
分别独立地为酯键,或类似物,以及
R
3a
和R
3b
分别独立地为脂溶性维生素残基或类似物。
Simple Method for the Preparation of Symmetrical Alkyl and Aryl Disulfides with Alkyl Sulfonyl Halides in Nitrogenous Base
作者:Firdous Imran Ali、Imran Ali Hashmi、Bina S. Siddiqui、Munawwer Rasheed
DOI:10.1080/00397910701459498
日期:2007.8
Abstract In the present study, the reaction of thiols with alkyl sulfonyl halides was carried out in a nitrogenous base to compare the reactivity of ‐SH with that of ‐OH, which, however, led to the formation of disulfides. The reaction achieved as a result offers the use of an inexpensive reagent, quantitative yields of the product, and simplicity for the formation of the S‐S bond.
Novel carbapenem derivatives of quarternary salt type
申请人:——
公开号:US20030022881A1
公开(公告)日:2003-01-30
An objective of the present invention is to provide carbapenem derivatives which have potent antibiotic activity against MRSA, PRSP, Influenzavirus, and &bgr;-lactamase-producing bacteria and are stable against DHP-1. The compounds according to the present invention are compounds represented by formula (I) or pharmaceutically acceptable salts thereof:
1
wherein R
1
represents H or methyl; R
2
and R
3
each independently represent H, halogen, lower alkyl or the like; R
4
represents optionally substituted lower alkylthio or the like; and R
5
represents optionally substituted lower alkyl or the like.
An objective of the present invention is to provide carbapenem derivatives which have potent antibiotic activity against MRSA, PRSP, Influenzavirus, and &bgr;-lactamase-producing bacteria and are stable against DHP-1. The compounds according to the present invention are compounds represented by formula (I) or pharmaceutically acceptable salts thereof:
1
wherein R
1
represents H or methyl; R
2
and R
3
represent H, a halogen atom, alkyl or the like; and R
4
represents substituted lower alkylthio or the like.
The present invention aims to provide a cationic lipid that can be used as a nucleic acid delivery carrier, a lipid membrane structure using a cationic lipid, a nucleic acid-introducing agent using a cationic lipid, and a method of achieving nucleic acid introduction by using a nucleic acid-introducing agent containing a cationic lipid. A lipid membrane structure containing a cationic lipid represented by the formula (1)
wherein each symbol is as defined in the DESCRIPTION, is superior in the stability in blood and tumor accumulation property. A nucleic acid-introducing agent using the cationic lipid can achieve high nucleic acid delivery efficiency of nucleic acid to be delivered into the cytoplasm.
[EN] DYE COMPOSITION COMPRISING AT LEAST ONE COLORLESS DISULFIDE/THIOL PRECURSOR, AND DYEING PROCESS USING THE COMPOSITION<br/>[FR] COMPOSITION COLORANTE COMPRENANT AU MOINS UN PRÉCURSEUR DE DISULFURE/THIOL INCOLORE ET PROCÉDÉ DE TEINTURE UTILISANT LA COMPOSITION
申请人:OREAL
公开号:WO2009040354A1
公开(公告)日:2009-04-02
The present invention relates to the dyeing of keratin materials using two colorless dye precursors, at least one of which contains a disulfide/thiol unit, said precursors reacting together chemically to form the color in situ. The process according to the invention makes it possible in the context of certain variants to solve the problems caused by the color generated during the process, while at the same time not degrading the efficacy of the coloration, and especially of the lightening effect. The colorations obtained are moreover powerful, chromatic, sparingly selective, and fast with respect to external agents such as sunlight, perspiration and especially shampoo.