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5308450 
Journal Article 
PHOSPHINE-LIGANDS .2. BIDENTATE PHOSPHINES OF HETEROARENES - 4,6-BIS(DIPHENYLPHOSPHINO)DIBENZOFURAN AND 4,6-BIS(DIPHENYLPHOSPHINO)DIBENZOTHIOPHENE 
Haenel, MW; Jakubik, D; Rothenberger, E; Schroth, G 
1991 
1 
Chemische Berichte
ISSN: 0009-2940 
VCH PUBLISHERS INC 
DEERFIELD BEACH 
124 
8 
1705-1710 
English 
WOS:A1991GC71200005 
Twofold lithiation of dibenzofuran (6) and dibenzothiophene (12) with n-butyllithium/N,N,N',N'-tetramethylethylenediamine (TMEDA) in n-hexane or n-pentane followed by the reaction with chlorodiphenylphosphine yielded the title compounds 4 and 5, respectively. The monophosphines 4-(diphenylphosphino)dibenzofuran (11) and 4-(diphenylphosphino)dibenzothiophene (15) were obtained analogously via the monolithium compounds 9 and 14 of the heteroarenes. In the case of dibenzofuran (6), it was shown that mono- and dilithiation is controlled by temperature. 
PHOSPHINE LIGANDS; DIBENZOFURAN; DIBENZOTHIOPHENE; LITHIUM COMPOUNDS; MULTIPLE LITHIATION