AbstractThis paper reviews the use of supercritical fluids in various aspects of the food industry, and is divided into six different areas: modeling of supercritical fluids, separation of extracted material, supercritical carbon dioxide as a solvent for extraction, supercritical fluids and analytical uses, and supercritical fluids and novel methods of food processing. An assortment of solutes are covered in the extraction section of the paper, including antineoplastic agents and lipids. The analytical methods section covers supercritical fluid chromatography, pesticide detection, and lipid analysis. The novel methods section discusses supercritical fluid extrusion and a new method of eliminating hexane from soybean oil.
Direct halogenation of alcohols with halosilanes under catalyst- and organic solvent-free reaction conditions
作者:Njomza Ajvazi、Stojan Stavber
DOI:10.1016/j.tetlet.2016.04.083
日期:2016.6
A chemoselective method for the direct halogenation of different types of alcohols with halosilanes under catalyst- and solvent-freereactionconditions (SFRC) is reported. Various primary, secondary and tertiary benzyl alcohols and tertiary alkyl alcohols were directly transformed to the corresponding benzyl and alkyl halides, respectively, using chlorotrimethylsilane (TMSCl) and bromotrimethylsilane
Alkylation de quelques composés carbonylés par des groupes tertiaires. Utilisation de la réaction de friedel-crafts dans la synthèse d'ésters
作者:Claude Lion、Jacques-Emile Dubois
DOI:10.1016/s0040-4020(01)92017-4
日期:1981.1
t-Alkylation of carboxylic esters via their ketene alkyltrimethylsilyl acetals by the Friedal-Crafts reaction allows the synthesis of new highly hindered compounds. A new route using sodium amide in dimethoxyethane, for the preparation of trimethylsilylenol ethers of ketones, is described. The α-t-butylation of these compounds permits the synthesis of new crowded pentasubstituted ketones. The limits
Condensation chlorure d'acide-organomagnesien en presence d'halogenure cuivreux: Competition des reactions heterolytique et homolytique. synthese de cetones aliphatiques ramifiees
作者:J.E. Dubois、M. Boussu
DOI:10.1016/0040-4020(73)80220-0
日期:1973.1
hindered acid chlorides RCOCl towards ethylmagnesium bromide in the presence of cuprouschloride has been studied. In addition to the ketones RCOEt, the compounds RCOCOR, RCOR, RR, RH and R(H) are produced by a radical reaction. The condensation of R′MgX with iPr2CHCOCl in the presence of cuprous halide proceeds via alkylcopper species R′Cu.MgXX′ which reacts with the acid chloride to produce the
Catalytic meta-selective C–H functionalization to construct quaternary carbon centres
作者:Andrew J. Paterson、Sahra St John-Campbell、Mary F. Mahon、Neil J. Press、Christopher G. Frost
DOI:10.1039/c5cc03951g
日期:——
A ruthenium catalyzed meta-selective C–H functionalization of 2-phenylpyridines with tertiary halides is described to establish challenging quaternary carbon centres in a regioselective manner. Preliminary studies suggest the C–H functionalization proceeds through a radical process directed via a remote σ-activation.
Kinetics and mechanisms of solvolysis of 3-chloro-3-ethylpentane in alcohols as solvents. Application of multiparametric equations and factor analysis to the solvolytic reactions of<i>tert</i>-alkyl halides
作者:Lídia M. P. C. Albuquerque、M. Luísa C. J. Moita、Raquel M. C. Gonçalves