Synthesis and reactivity of pentafluorophenylfluoroborates and potassium-1H,1H,2H,2H-perfluorooctyltrifluoroborate

Derivate 5465

3.33 MB in 2 files, last changed at 23.10.2006

File list / details

FileFiles changed onSize
DissFritzen.pdf11.04.2003 00:00:003.31 MB
index.html23.10.2006 15:07:5518.2 KB
The potassium pentafluorophenylfluoroborates were prepared by hydroxy-fluoride-substitution of fluoroorganoalkoxyboranes and -borates with potassium bifluoride. Those intermediate boranes and borates were obtained by the reaction of fluoroorganomagnesium reagents and alkoxyboranes. The introduction of one or two pentafluorophenylgroups into various alkoxyboranes is investigated to optimize the yield of potassium pentafluorophenyltrifluoroborate and bis(pentafluorophenyl)difluoroborate. Reactions of pentafluorophenylfluoroborates with the Lewis acids borontrifluoride and tris(pentafluorophenyl)borane show the Lewis acidity of pentafluorophenyldifluoroborane compared with borontrifluoride and tris(pentafluorophenyl)borane. Pentalfuorophenylfluoroborate salts reacted with iodinepentafluoride by transfer of a pentafluorophenylgroup to iodinepentafluoride. To develop an alternative method to fluorooganofluoroborates systematic investigations on the reactivity of fluoroorganoboranes to fluorides were undertaken. Potassium-1H,1H,2H,2H-perfluorooctyltrifluoroborate is prepared by the reaction of an organogrignard reagent with chlorodimethoxyborane and hydrolysis and hydoxy-fluoride-substitution of the product. Treatment of the borate wit borontrifluoride provides the corresponding difluoroborane with ponytailgroup.
PURL / DOI:
Bookmark:
Dokumententyp:
Wissenschaftliche Abschlussarbeiten » Dissertation
Fakultät / Institut:
Fakultät für Chemie
Dewey Dezimal-Klassifikation:
500 Naturwissenschaften und Mathematik » 540 Chemie
Keywords:
Lewis acidity, Perfluoroalkyl, Borane, NMR spectroscopy, Borate, Pentafluorophenyltrifluoroborate, Bis(pentafluoro)difluoroborate
Contributors:
Prof. Dr. rer. nat. Frohn, Hermann-Josef [Thesis advisor]
Prof. Dr. Willner, H. [Reviewer]
Language:
Deutsch
Collection / Status:
Dissertations / Document published
Document created on:
11.04.2003
Files changed on:
23.10.2006
Date of doctoral degree:
11.04.2003
Medientyp:
Text