Modification of ligand properties of phosphine ligands for C–C and C–N bond-forming reactions
摘要:
A series of ligands have been prepared for use in Pd-catalysed coupling reactions to form C-C and C-N bonds; significant differences are exhibited by similar ligands containing different phosphorus substituents. (c) 2006 Elsevier Ltd. All rights reserved.
Anhydrous flouride salts and reagents and methods for their production
申请人:DiMagno G. Stephen
公开号:US20060089514A1
公开(公告)日:2006-04-27
Anhydrous organic fluoride salts and reagents prepared by a method comprising the nucleophilic substitution of a fluorinated aromatic or fluorinated unsaturated organic compound with a salt having the formula:
[Q
n
M]
x+
A
x
−
in an inert polar, aprotic solvent; wherein M is an atom capable of supporting a formal positive charge, the n groups Q are independently varied organic moieties, n is an integer such that the [Q
n
M] carries at least one formal positive charge, x is an integer defining the number of formal positive charge(s), +, carried by the [Q
n
M], A
−
is an anionic nucleophile capable of substituting for F in the fluorinated compound and F represents fluorine or a radioisotope thereof.
Modification of ligand properties of phosphine ligands for C–C and C–N bond-forming reactions
作者:David J. Morris、Gordon Docherty、Gary Woodward、Martin Wills
DOI:10.1016/j.tetlet.2006.12.027
日期:2007.2
A series of ligands have been prepared for use in Pd-catalysed coupling reactions to form C-C and C-N bonds; significant differences are exhibited by similar ligands containing different phosphorus substituents. (c) 2006 Elsevier Ltd. All rights reserved.
Anhydrous Tetrabutylammonium Fluoride
作者:Haoran Sun、Stephen G. DiMagno
DOI:10.1021/ja0440497
日期:2005.2.1
Tetrabutylammoniumfluoride (TBAF) is prepared at low temperature by nucleophilic aromatic substitution of hexafluorobenzene with tetrabutylammonium cyanide. Adventitious water is scavenged during this synthesis by the generated hexacyanobenzene, which readily adds waterunder basic conditions. Contrary to expectations, TBAF is stable to Hofmann elimination in polar aprotic solvents under anhydrous