Simple and Rapid Procedures for the Synthesis of 5-Acylated 4β-Acylamido- and 4β-Acetoxyneuraminic Acid Glycals
作者:Irene S. Agnolin、Paola Rota、Pietro Allevi、Antonio Gregorio、Mario Anastasia
DOI:10.1002/ejoc.201201001
日期:2012.10.8
Two simple and rapidprocedures affording 4β-acylamido- and 4β-acetoxyneuraminic acid glycals acylated or perfluoroacylated at the 5-amino group are reported. The first protocol avoids the formation of oxazolines to synthesize the 4β-acetamido glycals through the Ritter reaction. The second passes through the oxazoline derivative to prepare 4β-acetoxyneuraminic acid glycals. Both protocols start from
Described herein is fluorinated dye comprising: a fluorescing coumarin-derived moiety connected to an oligomer of hexafluoropropylene oxide via a non-fluorinated divalent linking group. Such fluorinated dyes are soluble in fluorinated fluids and may be used to detect leaks in various systems such as refrigerant, air conditioning and/or heat transfer systems.
treating these mixture with anhydrousaluminumchloride at 150 /sR 160 °C during /sR 48 hrs in order to convert the latter into the easy-separable perfluoro(2,5,5- trichloro-2-alkyloxolane)s. Small quantities of new perfluoro(5,5-dichloroalkanoyl chloride)s were also among the chlorination products. The spectroscopic data as well as the physical properties of these new fluorination products, and perfluoro(2
将5种2-烷基取代的氧烷(如2-乙基氧烷,2-正丙基氧烷,2-异丙基氧烷,2-正丁基氧烷和2-正戊基氧烷)进行电化学氟化,得到相应的全氟(2-烷基氧烷) s。从这些起始原料与异构全氟(2-烷基氧戊烷),全氟(2-烷基-5-甲基氧杂戊烷)和全氟(二烷基醚)一起以高收率获得全氟(2-烷基恶烷)。在/ sR于150 / sR 160°C下用无水氯化铝处理这些混合物后,通过回收未反应的前者,成功地纯化了含有少量异构全氟(2-烷基氧戊烷)异构体的全氟(2-烷基氧烷)。为了将后者转化为易分离的全氟(2,5,5-三氯-2-烷基氧戊烷),需要48小时。少量新的全氟化合物(5,5-二氯链烷酰氯也属于氯化产物。介绍了这些新型氟化产物,全氟(2,5,5-三氯-2-烷基氧戊烷)和全氟(5,5-二氯链烷酰氯)的光谱数据以及物理性质。
[EN] PERFLUOROCARBON-SOLUBLE COMPOUNDS<br/>[FR] COMPOSÉS SOLUBLES DANS DES PERFLUOROCARBONES
申请人:UNIV SOUTHERN CALIFORNIA
公开号:WO2005107764A1
公开(公告)日:2005-11-17
The invention describes syntheses and purifications of several perfluorocarbon-soluble compounds having a general formula RF - L - X or RF - L - X - L - RF, wherein RF is a perfluorocarbon group, X is a hydrophilic moiety, and L is an amide linkage of general structure -CO-NH-. The invention also provides microemulsions comprising a PFC forming an oil phase, water or aqueous solution forming a water phase, and a PEG-based fluorosurfactant with an HFB (hydrophilic groups to fluorophilic groups balance) value from about 7 to about 13. The invention also provides a method of amidification of a fluorocompound. The method involves mixing perfluoracid chloride of a general formula CnF2n+1COCI with a compound containing an amine group with a general structure R-NH2 under reaction conditions sufficient to obtain a product having a general formula CnF2n+1-CONH-R.
该发明描述了合成和纯化几种可溶于全氟碳化合物的化合物,其通用式为RF - L - X或RF - L - X - L - RF,其中RF是全氟碳基,X是亲水基团,L是一般结构为-CO-NH-的酰胺键。该发明还提供了微乳液,包括形成油相的PFC,形成水相的水或水溶液,以及具有HFB(亲水基团到亲氟基团平衡)值约为7至13的基于PEG的氟表面活性剂。该发明还提供了一种氟化合物的酰胺化方法。该方法涉及将通用式为CnF2n + 1COCI的全氟酸氯与含有一般结构为R-NH2的胺基团的化合物在足够的反应条件下混合,以获得通用式为CnF2n + 1-CONH-R的产物。