The nucleophilic trichloromethylation of fluoroketones was carried out by the reductive addition of CCl4 in the presence of aluminum or by the reaction of trichloroacetic acid in HMPTA. The trichloromethylcarbinols obtained were used in the synthesis of perfluorinated tertiary alcohols and trifluoromethylated 1,1-dichlorooxiranes.
The nucleophilic trichloromethylation of fluoroketones was carried out by the reductive addition of CCl4 in the presence of aluminum or by the reaction of trichloroacetic acid in HMPTA. The trichloromethylcarbinols obtained were used in the synthesis of perfluorinated tertiary alcohols and trifluoromethylated 1,1-dichlorooxiranes.
Synthetic application of 3,3-dichloro-1,1,1-trifluoroacetone (DCTFA) and 3,3,3-trichloro-1,1,1-trifluoroacetone (TCTFA) for trifluorolactic acid derivatives
the other hand, α-substituted trifluorolactic acid derivatives, such as α-methyltrifluorolactic acid and Mosher’s acid, were obtained by addition reaction between TCTFA and carbon nucleophiles, followed by subsequent transformation of trichloromethylgroup.
Chirality-dependent sublimation of -(trifluoromethyl)-lactic acid: Relative vapor pressures of racemic, eutectic, and enantiomerically pure forms, and vibrational spectroscopy of isolated (S,S) and (S,R) dimers
作者:Merwe Albrecht、Vadim A. Soloshonok、Lena Schrader、Manabu Yasumoto、Martin A. Suhm
DOI:10.1016/j.jfluchem.2009.11.015
日期:2010.4
A mass-spectrometric determination of the sublimation pressure diagram of alpha-(trifluoromethyl)-lactic acid as a function of its enantiomeric composition at 293 K shows that the racemic crystals have a 38 +/- 15% higher volatility than the enantiomerically pure crystals and the sublimation eutectic has a 55 +/- 10% higher vapor pressure. These data indicate a possibility for thermodynamically controlled enantiomeric enrichment of the residual material via sublimation of samples of higher than 35 +/- 10% ee. The vibrational spectroscopy of isolated (S,S) and (S,R) dimers in supersonic jets shows that chirality recognition effects are restricted to larger clusters. This is a consequence of the rigid planar carboxylic acid binding motif. (C) 2009 Elsevier B.V. All rights reserved.