Synthesis and Structural Characterizations of para-bis(dialkyl/ diarylphosphino)phenylenes Built Around Tetrahalogenated Benzene Cores
Document Type
Article
Publication Date
8-2005
Department
Department of Chemistry
Abstract
Double deprotonation of 1,2-dibromo-4,5-difluorobenzene and 1-bromo-2-chloro-4,5-difluorobenzene by lithium diisopropylamide (LDA) in ethereal solutions is facile at very low temperatures (T<-90 °C). The organo-dilithium intermediates thus generated react readily with chlorophosphines ClPR2 (R=Ph and/or iPr), producing 1,2-dibromo-3,6-bis(diphenylphosphino)-4,5-difluorobenzene (1a), 1,2-dibromo-3,6-bis(diisopropylphosphino)-4,5-difluorobenzene (1b) and 1-bromo-2-chloro-3,6-bis(diphenylphosphino)-4,5-difluorobenzene (1c). Corresponding P-oxides 2a-c are obtained by oxidation of 1a-c with H2O2. Analogous reactions of 1,2-dibromo-4,5- difluorobenzene and 1-bromo-2-chloro-4,5-difluorobenzene with only 1 equiv. of LDA do not result in selective monodeprotonations, as 1a and 1c are formed preferentially after ClPPh2 quench. All of the isolated new compounds were fully characterized by multinuclear NMR spectroscopy, elemental analysis and/or mass-spectrometry. In addition, 1a, 1c, 2a, and 2b were characterized by single crystal X-ray diffraction methods.
Publication Title
Inorganica Chimica Acta
Recommended Citation
Kongprakaiwoot, N.,
Bultman, M.,
Luck, R.,
&
Urnezius, E.
(2005).
Synthesis and Structural Characterizations of para-bis(dialkyl/ diarylphosphino)phenylenes Built Around Tetrahalogenated Benzene Cores.
Inorganica Chimica Acta,
358(12), 3423-3429.
http://doi.org/10.1016/j.ica.2005.04.016
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/6497
Publisher's Statement
© 2005 Elsevier B.V. All rights reserved.