Concept

Fluorure

Publications associées (38)

Ab initio molecular dynamics simulation of liquid hydrogen fluoride

We have performed an ab initio mol. dynamics (MD) simulation of the structure of liq. hydrogen fluoride. Our results exhibit a strong contraction of the hydrogen bond in going from the gas to the liq. phase. The local structure of the liq. resembles that o ...

1997

About the "physiological size" of fluorine substituents: comparison of sensorially active compounds with fluorine and methyl substituted analogs

The taste of four fluoro substituted derivs. is almost indistinguishable from that of the parent compd. 4-(4-hydroxyphenyl)butan-2-one, the main flavor component of raspberries. The same holds for the comparison between the corresponding acetate, another r ...

1996

The selective O-acylation of enolates providing simple entry to O-enesters

In the presence of catalytic amts. of a fluoride source, O-trimethylsilyl enethers undergo condensation with acyl fluorides to afford O-enesters with high yields. The intermediates and final products are pure (Z) isomers if only one double bond is in conju ...

1995

Improved growth and methane production conditions for Methanobacterium thermoautotrophicum

Urs von Stockar, Ian William Marison

M. thermoautotrophicum was grown on a defined mineral salts medium under strictly anaerobic conditions with H2 and CO2 as the sole energy and C sources, resp. The cultivation medium was optimized with respect to non-org. components, including Se(IV), W(VI) ...

1993

Direct writing of iridium lines with a focused ion beam

Hubert van den Bergh, Patrik Willi Hoffmann

Direct writing of metal features narrower than 100 nm is accomplished by scanning a focused ion beam over a substrate covered with a thin solid metalorg. film. A metalorg. cluster coordination compd. [Ir4(CO)11Br] [N(C2H5)4] is spun on an oxidized Si wafer ...

1991

A stereocontrolled access to vicinal difluoroalkanes

An expedient method for the prepn. of diastereomerically and, by extension, even enantiomerically pure vicinal difluoroalkanes is described. The two fluorine atoms are introduced in two consecutive steps: ring opening of an oxirane by addn. of hydrogen flu ...

1988

Base-promoted elimination of hydrogen fluoride from alkyl fluorides: reactivity and stereochemistry

The alcoholate-promoted dehydrohalogenation of 5-nonyl fluoride and cyclododecyl fluoride, typical straight-chain and, resp., medium-size cyclic substrates, leads to cis- and trans-alkenes in an approx. ratio of 1:3. With bulky bases such as lithium diisop ...

1988

Pickling method for aluminum

Christos Comninellis

Etched Al of uniform quality is obtained at a const. rate by pptg. Al(OH)3 from the bath with simultaneous regeneration of the NaOH or KOH. The pptn. is promoted by addn. of Na2CO3. Filterability of the ppt. is improved by the addn. of complexing agents, e ...

(Switz.).1985

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