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Organometallic Chemistry of Fluorinated Allenes
Author(s) -
Lentz Dieter,
Nickelt Natascha,
Willemsen Stefan
Publication year - 2002
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/1521-3765(20020301)8:5<1205::aid-chem1205>3.0.co;2-g
Subject(s) - allene , chemistry , cationic polymerization , ligand (biochemistry) , stereochemistry , medicinal chemistry , polymer chemistry , catalysis , organic chemistry , receptor , biochemistry
Reaction of 1,1‐difluoroallene and tetrafluoroallene with a series of transition metal complex fragments yields the mononuclear allene complexes [CpMn(CO) 2 (allene)] ( 1 ), [(CO) 4 Fe(allene)] ( 2 ), [(Ph 3 P) 2 Pt(C 3 H 2 F 2 )] ( 4 ), [Ir(PPh 3 ) 2 (C 3 H 2 F 2 ) 2 Cl] ( 5 ), and the dinuclear complexes [( μ ‐ η 1 ‐ η 3 ‐C 3 H 2 F 2 )Fe 2 (CO) 7 ] ( 3 ), [Ir(PPh 3 )(C 3 H 2 F 2 ) 2 Cl] 2 ( 6 ), and [( μ ‐ η 2 ‐ η 2 ‐C 3 H 2 F 2 ){CpMo(CO) 2 } 2 ] ( 9 ), respectively. In attempts to synthesize cationic complexes of fluorinated allenes [CpFe(CO) 2 (C(CF 3 )=CH 2 )] ( 7 a ), [CpFe(CO) 2 (C(CF 3 )=CF 2 )] ( 7 b ) and [ μ ‐I‐{CpFe(CO) 2 } 2 ][B{C 6 H 3 ‐3,5‐(CF 3 ) 2 } 4 ] were isolated. The spectroscopic and structural data of these complexes revealed that the 1,1‐difluoroallene ligand is coordinated exclusively with the double bond containing the hydrogen‐substituted carbon atom. 1,1‐Difluoroallene and tetrafluoroallene proved to be powerful π acceptor ligands.