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published May 1, 1994
posted in Papers - 1994
author

MODEL COMPOUNDS AND MONOMERS DERIVED FROM 1,1-DIFLUOROETHENE

Author(s):CHAMBERS, RD; APSEY, GC; ODELLO, P; MOGGI, G; NAVARRINI, W.

Source:MACROMOLECULAR SYMPOSIA

Volume 82, Issue 1, pages 33-50, May 1994

ABSTRACT:

Saturated model compounds, related to elastomers that are derived from co-polymers of CH2=CF2/CF2=CFCF3, have been synthesised and studied. Unsaturated compounds were obtained by both base- and Lewis-acid induced processes. Some reactions with antimony pentafluoride lead to remarkably stable carbocations, and even di-cations, and the nmr data for these systems is revealing about structure. Polyconjugated polymers may be obtained by this procedure. Preliminary studies are described, relating to the incorporation of crowded monomers into fluorocarbon polymers, ultimately, as a means of initiating cross-linking processes for curing elastomers.

http://onlinelibrary.wiley.com/doi/10.1002/masy.19940820105/abstract;jsessionid=E7184FE1AA06A64E7389B89E95CFDEFC.f02t03
published March 22, 1994
posted in Patents - 1994
author

Process for preparing 1,3-dioxoles

US Patent: 5296617

Date: March. 22 1994

Inventors: Navarrini Walter, Fontana, Simonetta

US5296617 – PDF

published March 13, 1994
posted in Oxyfluorides, Papers - 1994
author

NOVEL MOLECULES AND INDUSTRIAL-PROCESSES INSPIRED BY CADY,G.H. RESEARCH ON HYPOFLUORITES

Author(s): DESMARTEAU, DD ; NAVARRINI, W; ZEDDA, A; RUSSO; MONTANARI, V

Source: ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY

Volume: 207 Pages:12 FLUOPart:1Published: MAR 13 1994

published March 3, 1994
posted in Papers - 1994
author

Electrochemical Behavior and EPR of Radical Anions of Perfluoroalkyl-Substituted Olefins

Carlo Corvaja, Giuseppe Farnia, Gianni Formenton, Walter Navarrini, Giancarlo Sandona, Vito Tortelli

Source: JOURNAL OF PHYSICAL CHEMISTRY

Volume: 98 Issue: 9 Pages: 2307-2313

DOI: 10.1021/j100060a017

ABSTRACT:
Some perfluoroalkylolefins are shown to undergo electrochemical one-electron reduction to the corresponding radical anions at potential values which strongly depend on the structure of the substituents. In these cases the voltammetric reduction peak is chemically reversible, and a further one-electron transfer, affording the corresponding dianions, is detected at more negative potentials. For these substrates, at appropriate temperatures, the free radical anions are stable enough to be accumulated by macroscale electrolysis and investigated by EPR. The spectra are characterized by fairly large hyperfine couplings of F-19 in alpha, beta, and gamma positions relative to the pi carbon centers and by line width effects due to restricted rotations of the perfluoroalkyl groups around the C-C single bonds. The case of tetrakis(trifluoromethyl)ethylene has been analyzed in detail, and it is concluded that the rotation motion of the four trifluoromethyl groups should be in part correlated.
http://pubs.acs.org/doi/abs/10.1021/j100060a017
published September 14, 1993
posted in Oxyfluorides, Patents - 1993
author

Process for the Dehalogenation of 1,3-Dioxolanes

US Patent: 5245054

Date: Sep. 14, 1993

Inventors: W. Navarrini, L. Bragante

US5245054 – PDF

published August 31, 1993
posted in Patents - 1993
author

Process for Preparing Perfluoroalkoxysulphonic Compounds

US Patent: 5241110

Date: Aug. 31, 1993

Inventors: W. Navarrini, V. Montanari, A. M. Staccione

US5241110 – PDF

published August 10, 1993
posted in Patents - 1993
author

Halogenated 1,3-Dioxolanes

US Patent: 5235074

Date: Aug. 10 1993

Inventors: W. Navarrini, S. Fontana, V. Montanari

US5235074 – PDF

published July 20, 1993
posted in Patents - 1993
author

Method for Preparing Perfluoro-Oxaziridines

US Patent: 5229525

Date: Jul. 20 1993

V. A. Petrov, D. D. Desmarteau, W. Navarrini

US5229525 – PDF

published July 13, 1993
posted in Patents - 1993
author

Process for Producing Salts of Fluorinated Alcohols

US Patent: 5227539

Date: Jul. 13 1993

Inventors: S. Kotun, D. Desmarteau, W. Navarrini

US5227539 – PDF

published July 6, 1993
posted in Patents - 1993
author

Process for Preparing Halogenated 1,3-Dioxolanes

US Patent: 5225576

Date: Jul. 6 1993

Inventors: W. Navarrini, S. Fontana, V. Montanari

US5225576 – PDF

published May 11, 1993
posted in Patents - 1993
author

Perfluorinated cyclic hemiketals, corresponding perfluorodiketones and process for preparing them

US Patent: 5210238

Date: May. 11 1993

Inventors: Anderson John D. , Desmarteau Darryl D. , Navarrini Walter.

US5210238 – PDF

published March 23, 1993
posted in Patents - 1993
author

Polyperfluoroaminoethers

US Patent: 5196595

Date: March. 23 1993

Inventors: W. Navarrini, D. D. Desmarteau.

US5196595 – PDF

published January 5, 1993
posted in Patents - 1993
author

Process for Preparing Perhalogenated Olefins

US Patent: 5177272

Date: Jan. 5 1993

Inventors: V. Montanari, D. D. Desmarteau, W. Navarrini

US5177272 – PDF

published April 7, 1992
posted in Patents - 1992
author

Process for Preparing Perfluoroalkenyl-Sulfonyl Fluorides

US Patent: 50103051 A

Date: Apr. 7 1992

Inventors: W. Navarrini, S. Modena

ABSTRACT

A continuous process for preparing perfluoroalkenyl sulfonyl fluorides (I)

Rf-CF=CF-SO2F (I)

wherein Rf is selected from the group consisting of F and a perfluoroalkyl group of from 1 to 9 carbon atoms is disclosed, in which a perfluoroalkyl (sulfonyl fluoride) monofluoroacetyl fluoride of formula

Rf-CF2-CF(COF)SO2F (II)

is used as the starting product. The starting product is contacted with a reactant selected from the group consisting of the oxides of an element of the Groups IA, IIA, IIB, IIIA and IVA of the Periodic Table of Elements, at a temperature comprised within the range of 150 to 450 C, and the compound (I) is recovered from the reaction effluent.

US5103051 – PDF

published April 7, 1992
posted in Patents - 1992
author

Process for Preparing Perfluoroalkenyl-Sulfonyl Fluorides

US Patent: 50103050 A

Date: Apr. 7 1992

Inventors: W. Navarrini, S. Modena

ABSTRACT

A continuous process for preparing perfluoroalkenyl sulfonyl fluorides (I)

Rf-CF=CF-SO2F (I)

wherein: Rf is selected from the group consisting of F and a perfluoroalkyl radical of from 1 to 9 carbon atoms is disclosed, in which as the starting compound a sultone (II) Immagine_92 (II)

is used. The starting compound is placed into contact with a reactant selected from the group consisting of oxides and carbonates of an element of the Goups IA, IIA and IIB, and of the oxides of an element of the Groups IIIA and IVA of the Periodic Table of the Elements, and their mixtures, at a temperature comprised within the range of from 150 to 450 C, and the compound (I) is recovered from the reaction effluent.

US5103050 – PDF