Catalytic cycloaddition of diazoalkanes to fullerene C60
作者:A. R. Tuktarov、V. V. Korolev、D. Sh. Sabirov、U. M. Dzhemilev
DOI:10.1134/s1070428011010039
日期:2011.1
monosubstituted diazomethanes generated in situ by oxidation of aldehyde hydrazones in the presence of Pd(acac)2-2 PPh3-4 Et3Al as catalytic system resulted in selective formation of homofullerenes in which the alkyl substituent is located above the plane of the five-memberedring in C60. Under analogous conditions, unsymmetrical disubstituted diazomethanes generated from the corresponding ketone hydrazones gave
在作为催化体系的Pd(acac)2 -2 PPh 3 -4 Et 3 Al的存在下通过醛oxidation酮的氧化原位生成的单取代重氮甲烷在富勒烯C 60上的环加成反应导致选择性形成高富勒烯,其中烷基取代基位于其中在C 60中五元环的平面之上。在类似条件下,由相应的酮生成的不对称二取代重氮甲烷产生了立体异构的5,6-开口加合物的混合物。
Palladium-catalyzed selective cycloaddition of diazo compounds to [60]fullerene
The effective catalytic method for cycloaddition of higher diazoalkanes and diazoacetates to [60]fullerene in the presence of the three-component catalytic system Pd(acac)2–PPh3–Et3Al has been developed. The yield and selective formation of the target homo- and methanofullerenes are dependent upon the structure of the original diazocompounds.
Kauffmann,T. et al., Angewandte Chemie, 1963, vol. 75, p. 1204
作者:Kauffmann,T. et al.
DOI:——
日期:——
[EN] USES OF HYDROPHOBICALLY-MODIFIED HYALURONIC ACID THROUGH AMIDE AND/OR HYDRAZIDE LINKAGES IN COSMETICS AND/OR DERMATOLOGY<br/>[FR] UTILISATIONS D'ACIDE HYALURONIQUE MODIFIÉ DE MANIÈRE HYDROPHOBE PAR DES LIAISONS AMIDE ET/OU HYDRAZIDE EN COSMÉTIQUE ET/OU EN DERMATOLOGIE
申请人:BIOKAWTHAR TECH
公开号:WO2018024902A1
公开(公告)日:2018-02-08
The present invention relates to the field of cosmetics and pharmaceuticals such as dermatology. Especially, the present invention relates to particles made of hyaluronic acid modified by amidation with hydrophobic groups having an amine or a hydrazine function having general formula (I), wherein Z, R and n are as defined in the claims. In particular, the particles of the invention are useful for restoring the endogenic production of hyaluronic acid and provide a lasting effect thanks to their slow degradation in vivo. The present invention also refers to a cosmetic care method comprising applying the particles of the invention on the skin of a subject in need thereof.