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Contributions to the Chemistry of Boron, 230 . Electrophilic Borylation of Metallocenes: Synthesis and Molecular Structures of 1,1′,3,3′‐Tetrakis(dibromoboryl)metallocenes of the Iron Triad
Author(s) -
Appel Andrea,
Nöth Heinrich,
Schmidt Martin
Publication year - 1995
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19951280615
Subject(s) - chemistry , borylation , boron , electrophile , yield (engineering) , metal , triad (sociology) , medicinal chemistry , cyclooctatetraene , carbocation , metallocene , crystallography , stereochemistry , photochemistry , inorganic chemistry , molecule , organic chemistry , catalysis , aryl , alkyl , materials science , polymer , metallurgy , polymerization , psychology , psychoanalysis
Reactions of metallocenes MCp 2 (M = Fe, Ru, Os) with an excess of BBr 3 at reflux temperature lead specifically to 1,1′,3,3′‐tetrakis(dibromoboryl)metallocenes 3, 7 , and 8 in high yield. MeBBr 2 and PhBBr 2 are less effective borylating agents. X‐ray structural analyses of 3, 7 , and 8 reveal an increasing tilt of the Br 2 B groups towards the metal center while retaining the trigonal‐planar environment at the boron atoms. This indicates a weak metal‐boron interaction of the kind found for carbon‐metal interactions in ferrocenyl carbocations.