Premium
Reaction of Alkylzirconocene Cation Complexes with (R–CC–) 2 SiR 2 Reagents: Preparation of Heterodimetallic Compounds Containing a μ‐Alkynyl Ligand Bridge Between Zirconium and Silicon
Author(s) -
Röttger Dirk,
Erker Gerhard,
Fröhlich Roland,
Kotila Sirpa
Publication year - 1996
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.19961290103
Subject(s) - chemistry , borane , zirconium , reagent , metallocene , medicinal chemistry , ligand (biochemistry) , alkyl , yield (engineering) , silane , boranes , crystal structure , polymer chemistry , boron , inorganic chemistry , crystallography , organic chemistry , polymerization , biochemistry , polymer , receptor , materials science , metallurgy , catalysis
The methylzirconocene cation, employed as the [Cp 2 ZrCH 3 (THF)] + BPh 4 − reagent 1a reacts with (R′CC) 2 SiR 2 substrates ( 6a–d ) by means of carbometallation of an alkynyl group to yield the mixed metal ring systems 8a–d , containing both a 1,1‐disubstituted μ‐alkenyl and an alkynyl bridge between zirconium and silicon (e.g. shown by X‐ray crystal structure analyses of complexes 8a and 8c ). A similar addition reaction takes place upon treatment of the (butadiene)zirconocene/tris(pentafluorophenyl)‐borane 1:1 addition product 9 with (CH 3 –CC) 2 Si(CH 3 ) 2 ( 6c ) to give 10 . Here the incipient alkyl zirconocene cation character of the metallocene/borate betaine complex 9 shows up in the alkynyl silane carbometallation reaction.