Info Kkw
Quantitative Analysis and Prediction of Partition Coefficients There have been several efforts to parameterize the above data such that fluorophilicities can be predicted 4-6 . One approach makes use of 3D QSAR descriptors and neural networks 4 . A host of parameters was considered percent fluorine, molecular volume, molecular surface, globularity, solvent accessible surface, solvent extended surface, solvent extended volume, calculated polarizability, calculated dipole moment, calculated...
The Birth of a Term
The title of this Handbook features a word, fluorous, which was not in the chemists vocabulary ten years ago. It was introduced in a classic 1994 paper by Horvath and Rabai, who envisioned a term that could be used analogously to ''aqueous'' or ''aqueous media'' 1 . Although there were earlier studies of reactions in ''fluorous media'' defined below 2 , the general concept remained unarticulated, almost like parallel worlds unaware of each other. Why not simply refer to fluorous solvents as...
Info Ywp
Tab. 9.2-3. Perfluoroalkylalkanols and ethers Remarks for synthesis of for reaction of etc. C3F7OCF CF3 CF2OCF CF3 CH2OH CF3 3CCH2OH C6Fl3CH2CH2 2C CH2OH 2 Rf8CH2CH2 2CHOH Rf6 CH2 n 2C CH3 OH, n 2,3 Rf6CH2CH2C CH3 2OH, Rfn CH2 2 2C CH3 OH, n 6,8 Rf6CH2CH2C CH3 2OH CF3 3COCH3, CF3 3COC2H5 RfnCH2CH -O- CH2, n 4,6,8 C3F7OCF CF3 CF2OCF CF3 CO2CH3 NaBH4 85 CF3 3CH CH2O Et3N, 100 C, 55 h no 86 yield data given One pot synthesis from RfnI and triallyl borate, 87 Preparation of and use for...
Conclusions and Perspectives
Highly fluorinated compounds provide behavior that is not seen and performances that are not reached by H-analogs. Most unique is the antipathy between FC and HC molecules or moieties that allows phase separation macro, micro and nano and endows colloidal systems with special properties. These properties may be exploited to control syntheses in fluorous phases. The presence of F-amphiphiles in a medium, including in the form of F-alkylated substrates, reagents or byproducts can significantly...
Uk
Christine Hiu-Tung Chen Fluorous Technologies Inc. 970 William Pitt Way Pittsburgh, PA 15238 USA Instituto de Ciencia de Materiales de Aragon Departamento de Qu mica Inorganica Universidad de Zaragoza-C.S.I.C 50009 Zaragoza Spain Friedrich-Alexander-Universit t Erlangen- Department of Chemistry University of Illinois at Chicago 845 West Taylor Street Chicago, IL 60607-7061 USA Centre d'Etudes Pharmaceutiques rue J.B. Clement Chatenay-Malabry 92296 Cedex France Dennis P. Curran Department of...
Fluorous Solvents and Related Media
3.2 Commercial Fluorous Solvents 11 3.3 Related Solvents and Media 13 3.3.1 Amphiphilic or Hybrid Solvents 13 3.3.2 Fluorous Ionic Liquids 13 3.3.3 ''Faux Fluorous'' Solvents 13 3.3.5 Bonded Fluorous Phases 14 3.4 Polarities of Fluorous Solvents 14 3.5 Solubilities of Solutes in Fluorous Solvents 15 3.6 Fluorous Non-fluorous Solvent Miscibilities 18 3.7 Special Reactivity Phenomena in Fluorous Solvents 21 References 22
Info Ptl
C6F14 C5H12 lt 0.5 gt 99.5 - 31 1,3- CF3 2C6F1o CH3C6Hs 81 19 gravimet 32 32 1,3- CF3 2C6F10 CH3C6H5 47 53 gravimet 32
Oxidation of Organic Sulfides
The first example of FB oxidation of sulfides dates back to 1995 dibenzothiophene and di-phenylsulfide gave the corresponding sulfones in low yields 1.4 and 10 , respectively upon treatment with O2 at 100 C in the presence of a not fully characterized perfluoro-carbon-soluble iron-phthalocyanine 19 . Following this earlier report, Con-tetraarylporphyrin Co-5 and Con-phthalocyanine Co-12 Scheme 10.11-4 were tested as catalysts for the FB oxidation of methyl phenyl sulfide and para-substituted...
Clsi Me 2ch2ch2c6f13 Synthesis
Types and Sources of Fluorous Silica Gel Materials and Products Fluorous silica gel has been prepared in ways that are generally analogous to standard reverse phase silica gels by bonding silanes to prepared silica. Most products have the general structure silica-O-Si Me 2 CH2 nRf where n is 2 or 3 and Rf is C6F13 or C8F17 these materials are prepared from silylating reagents of the general structure XSi Me 2 CH2 nRf. A few materials are prepared from reagents X3Si CH2 nRf that lack methyl...
HO Bvb
CAS Registry Number 5a-Cholestan-3b-ol dihydrocholesterol 80-97-7 , diisopropyl azo-dicarboxylate 2446-83-5 , and triphenylphosphine 603-35-0 are commercially available. acid 172701-34-7 was prepared from methyl 3,4,5-trihydroxybenzoate methyl gallate 99-24-1 and bromide 9932499-9 or iodide 38565-62-7 by a literature method 1 . Tetrahydrofuran THF was freshly distilled from sodium benzophenone. Step A. 5a-Cholestan-3a-yl 3 477935-28-7 A round-bottomed flask 100 mL is charged under nitrogen...
Cfchcoh
Rfn CH2 m OCH2CO2H, n m 7 1,8 2,10 2 RfnCF2I XSO3H X Cl, F RfnCF2OSO2X 163 H2O overall yield gt 70 Rfn 1I Br Rongalite-NaHCO3 DMF-H2O 164 C F2n 1I Zn-Cu CO2, CH3O 3PO, -20 C 165 -PIPA and -PIPA have been prepared from 166 CF3COCF3 and CF3CFCF2O precursors by a multistep synthesis Rf6 CH2 2OH CrO3 H2SO4, acetone-ether 167, 168 Rh2 OAc 4 toluene, 110 C -4 AcOH Rf6CH2CO2 4Rh2 CF3 2CCF2O HF CF3 3COH 169 ClCH2CO2R No yield data in Chem. Abstr. Rfn CH2 mOH BrCH2CO2H NaH, THF, r.t. 170 yield 70-96 BH3...
Info Otf
Slanting Data How to Make a Non-recoverable Catalyst Appear Recoverable An example from the authors' laboratory records shows how easy it is to obtain an incorrect picture of catalyst recoverability from yield data. The fluorous palladacycle 13 in Scheme 4-4 was evaluated as a catalyst in the Heck reaction, with recovery by sequence D in Figure 4-1, or variations thereof 19 . Screening experiments were conducted at somewhat high catalyst loadings for a Heck reaction 0.5 mol . Good yields were...
Info Hbn
onstrated that catalyst 39c could be recovered in 96 yield by extraction of the reaction mixture with hot perfluoromethyldecaline and could be reused in a second run. The reaction of perfluoro-tagged allyltin compounds with aldehydes catalyzed by PtCl2 PPh3 2 40a and PtCl2 PPh3_n C6H4-4-Rf n 2 40b-f , where Rf represents a linear or branched perfluoro alkyl chain, was described by Curran and coworkers Scheme 10.8-23 45, 46 . The reactions were performed using 5 to 10 mol of catalyst 40a-f...