通过双分子合成法合成了(CTA)1/3 [Cu 46(C 9 H 3 O 6)24(OH)12 ](PW 12 O 40)3 ·xH 2 O(COK-15b)的新材料MOF。模板方法,在无溶剂条件下,以化学计量比将季戊四醇与脂肪酸酯化为相应的季戊四醇四酯时,具有很高的活性和选择性,并具有高达98%的收率。通过TEM,SEM,TG,BET,TPD和Py-IR对COK-15b进行了表征。此外,研究了COK-15b的稳定性,可以将其重复使用5个运行周期而不会出现明显的失活。
A SIMPLE AND CONVENIENT ONE-POT SYNTHESIS OF FATTY ACID ESTERS FROM HINDERED ALCOHOLS USING<i>N</i>,<i>N</i>-DIMETHYLCHLORO-SULFITEMETHANIMINIUM CHLORIDE AS DEHYDRATING AGENT
作者:Savita Kaul、Ajay Kumar、Bir Sain、A. K. Gupta
DOI:10.1081/scc-120006474
日期:2002.1
ABSTRACT N,N-Dimethylchlorosulfitemethaniminium chloride (SOCl2-DMF) has been found to be an efficient reagent for one-pot synthesis of esters from equimolar amounts of fatty acids and hindered alcohols under mild conditions.
A multilayered Langmuir-Blodgett film aggregate, which contains on top of a solid support surface several monomolecular layers of a compound of liquid crystal type preferably having the general formula
wherein Rʹ and Rʺ independently refer to a substantially aliphatic hydrocarbon group of approximately 8 to 30 carbon atoms, Yʹ and Yʺ independently refer to the group -O-, -C(=O)-O-, which over the oxygen atom is bound to the group -(CH₂)n- or they refer to -CH₂-, nʹ and nʺ independently are zero or 1, R¹-X-H is a polar group wherein XH refers to hydroxy (OH), carboxyl (COOH), amino (NH₂), or an amino group substituted with a substantially aliphatic hydrocarbon group of not more than 30 carbon atoms, and R¹ is a direct bond, a carbonyl group -C(=O)-, lower alkylene or lower alkylene carboxyl lower alkylene, R² is hydrogen, lower alkyl or lower alkoxycarbonyl or has the meaning of R¹-X-H, or the meaning of Rʹ-Yʹ-(CH₂)nʹ-, provided that the compound (I) does not contain more than three lipophilic groups as defined.
An external skin treatment composition containing (I) vitamin A (retinol) and (II) as a stabilizer, an oil, polyethylene (propylene) glycol, a hydroxy carboxylate, a neutral amino acid salt, an oil-soluble antioxidant/EDTA/a benzophenone compound, an oil-soluble antioxidant/an acid/a benzophenone compound, an inclusion compound of cyclodextrin including an antioxidant and/or an ultraviolet absorber, butanediol and/or an oil-soluble antioxidant, a water-soluble benzophenone compound, a basic amino acid and the salt thereof, an acidic amino acid and the salt thereof, a polar oil, a water-swellable clay mineral.
The invention relates to an external skin treatment composition comprising (I) vitamin A selected from the group consisting of retinol, all-trans type retinol and 13-cis type retinol, and (II) at least one stabilizer selected from the group consisting of polyethyleneglycols (PEG) and polypropyleneglycols (PPG).