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Solvent‐free Tris(trimethylsilyl)methyllithium
Author(s) -
Hiller Wolfgang,
Layh Marcus,
Uhl Werner
Publication year - 1991
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199103241
Subject(s) - methyllithium , trimethylsilyl , agostic interaction , chemistry , solvent , tris , crystal structure , monomer , crystallography , atom (system on chip) , stereochemistry , medicinal chemistry , organic chemistry , metal , biochemistry , computer science , embedded system , polymer
n BuLi first reacts with BrHgC(SiMe 3 ), at 65–70 0 C in the melt to give the title compound within an hour. This is monomeric in solution and dimeric in the crystal (structure on the right), a novel structural type for solvent‐free alkyllithium compounds. Apart from the two direct bonds from Li to the carbanionic C‐atoms there are also agostic interactions with two H atoms of the SiMe 3 substituents, so that each Li atom is coordinated altogether in a distorted tetrahedral fashion.