z-logo
Premium
Synthesis of Alkyne Metathesis Catalysts from Tris(dimethylamido)tungsten Precursors
Author(s) -
Melcher Daniel,
Àrias Òscar,
Freytag Matthias,
Jones Peter G.,
Tamm Matthias
Publication year - 2020
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202000835
Subject(s) - chemistry , metathesis , alkoxide , bimetallic strip , tris , ligand (biochemistry) , medicinal chemistry , salt metathesis reaction , tungsten , amide , catalysis , polymer chemistry , organic chemistry , polymerization , biochemistry , polymer , receptor
Benzylidyne tungsten systems bearing a combination of alkoxide and amide ligands were readily obtained by partial alcoholysis of amido‐supported tungsten complexes. Benzylidyne tris(dimethylamido)tungsten was treated with fluorinated alcohols Me 2 (CF 3 )COH, Me(CF 3 ) 2 COH, and (CF 3 ) 3 COH, and also with silanols ( t BuO) 3 SiOH, and Ph 3 SiOH, all of which resulted in complexes of the type [PhC≡W(NHMe 2 )(NMe 2 )(OR) 2 ]. Full displacement of the amido ligands was also achieved in [PhC≡W(NHMe 2 ){OC(CF 3 ) 2 Me}{OSi(O‐ t Bu) 3 } 2 ] and [PhC≡W(NHMe 2 )(OSiPh 3 ) 3 ]. In addition, reaction of the three fluorinated alcohols with hexakis(dimethylamido)ditungsten yielded isomeric mixtures of bimetallic complexes [W 2 (NMe 2 ) 4 (OR) 2 ], which bear two electron‐donating ligands and one electron‐withdrawing ligand per tungsten atom. All amido‐substituted compounds are active in the self‐metathesis of 5‐benzyloxy‐2‐pentyne, although [W 2 (OR) 2 (NMe 2 ) 4 ] complexes require longer initiation times depending on the degree of fluorination of the tert ‐butoxide ligand.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here