Alkyl/fluoroalkyl groups

Sigaud G, Nguyen HT, Achard MF, Twieg RJ (1990) Phys Rev Lett 65 2796 and references cited therein. We note that alkyl and fluoroalkyl groups are nonpolar and interact primarily via dispersion (Van der Waals) forces Vru-aF H- Thus the... 

Triplet diphenylcarbene is chosen as a prototypical triplet system as it has been the most extensively studied of diarylcarbenes and abundant basic data are available. Alkyl, halo and fluoroalkyl groups have been used as kinetic protectors for DPCs (Scheme 9.36). 

An experimental and theoretical study of the Baeyer-Villiger (BV) oxidation of ketones has examined its uncatalysed and acid-catalysed forms, and fluoro- and chloro-substituted substrates.344 In assessing migratory aptitudes, fluoroalkyl groups are only slightly less favourable than alkyl (by 0.3/0.5 kcal mol-1, calculated/observed), whereas migration of a chlorinated substituent is significantly more difficult (ca 2.6 kcal mol-1). 

It was therefore reasonable for us to postulate that replacement of surface alkyl groups on the distan-noxanes with fluoroalkyl groups should render the molecules fluorophilic, and that mild catalysts would be accessible and workable under fluorous biphasic conditions. 

Poly(carborane-siloxanes) have a linear structure in which R and R" can be alkyl, fluoroalkyl or aryl groups. The main chain contains the carborane polyhedra. Most commonly C2B10H10 is the carborane used. 

Molecular silicas a closed cage with an inert organic group at each vertex (e.g., alkyl, fluoroalkyl, phenyl, PEG). Usually all the eight groups are the same but alternatives exist with seven identical groups plus one different one. 

Poly(3-fluoroalkylthiophene)s have been prepared electrochemically [207] and show high thermal stability, chemical inactivity, and hydrophobicity. Alkyl spacers were inserted between the thiophene ring and the fluoroalkyl groups in the monomer 12 in order to neutralize their unfavorable electronic effects. The introduction of up to 50% fluorine in the structure leads to elastomeric materials with higher electroactivity than poly(alkylthiophene)s [207]. 

Polyphosphazenes with simple alkyl and aryl substituents directly attached to the backbone by P-C linkages can be prepared by the condensation polymerization of N-silylphosphoranimine precursors. These simple polymers can then be converted to a variety of functionalized polyphosphazenes by derivatization reactions. In this paper, the synthesis and characterization of some derivatives of poly(methylphenyl-phosphazene), [Me(Ph)P=N]and the copolymer, [Me(Ph)P=N]j [Me2P=N)y, are discussed. These polymers include grafted copolymers, water soluble carboxylated polymers, and polymers with silyl, vinyl, alcohol, ester, ferrocene, phosphine, thiophene, and/or fluoroalkyl groups. 

It was found that the anion predominantly determines the CO2 solubility in the ionic liquid.Ionic liquids with anions containing fluoroalkyl groups, for example, bis(trifluoromethylsulfonyl)amide, show the highest CO2 solubility. It was also observed that an increase in the alkyl chain length on the cation increases the CO2 solubility in the ionic liquid. 

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