Accession Number:

AD0291973

Title:

RESEARCH ON SYNTHESIS OF 1000 F STABLE BASE FLUIDS

Descriptive Note:

Corporate Author:

MONSANTO RESEARCH CORP EVERETT MASS

Personal Author(s):

Report Date:

1961-10-17

Pagination or Media Count:

1.0

Abstract:

Work continued on synthesis of intermediates for perfluoro-polyaromatic systems, as still offering the most promise for highly thermally stable base fluids. Specifically, effort was concentrated on 1 the synthesis of C6F6 via the electrochemical fluorination route from benzoyl chloride and 2 the preparation of a minimum one-pound sample of 1,4-dibromotetrafluorobenzene as a valuable difunctional building block. One successful series of fluorinations of benzoyl fluoride in the new 100-ampere Simons cell led to 5200 grams of crude fluorocarbon product containing some 2050 grams of the desired C6F11 COF. Using an impure C6F10, a maximum yield of 37.2 C6F6 at 12.2 conversion has been achieved in a defluorination furnace with a single heated zone. In the synthesis of 1,4-dibromotetrafluorobenzene, about three kilograms of 2,4,5-trifluoroaniline were prepared in a five-step synthesis starting from 2,5-dichloronitrobenzene. This is over three times the expected yield at this stage, and is a result of a 3-12-fold i proved yield in one of the five steps. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE