Fluoride catalyzed P–aryl-coupling—a mild approach to functionalized arylphosphines

Trinuclear Diamagnetic Nickel(II) Complexes with Bridging 3‐Arylpyrazolato Ligands

“…NMR spectra were recorded with Bruker Avance 200, Bruker DPX 400, and Bruker Avance 600 spectrometers. 3‐Phenyl‐1 H ‐pyrazole ( 1a ),14a 3‐(4‐fluorophenyl)‐1 H ‐pyrazole ( 1b ),14b 3‐(4‐methoxyphenyl)‐1 H ‐pyrazole ( 1c ),12 3‐(1‐naphthyl)‐1 H ‐pyrazole ( 1d ),14a 3‐(2‐naphthyl)‐1 H ‐pyrazole ( 1e ),14a 3‐ferrocenyl‐1 H ‐pyrazole ( 1f ),14c and 3‐[4‐(diphenylphosphanyl)phenyl]‐1 H ‐pyrazole ( 1g )14d,14e were synthesized by following procedures published in the literature. The NMR spectroscopic data is assigned according to Schemes 2–8.…”

P,C-bond cleavage in the ligand sphere of a nickel(ii) complex

“…14 Reacting Ni(ClO 4 ) 2 (H 2 O) 6 with 1 in a 1 : 3 ratio in methanol gives the red-colored, five-coordinate nickel(II) complex 2 in high yields (Scheme 1). 14 Reacting Ni(ClO 4 ) 2 (H 2 O) 6 with 1 in a 1 : 3 ratio in methanol gives the red-colored, five-coordinate nickel(II) complex 2 in high yields (Scheme 1).…”

Coordination of Nickel(II) by 3‐(2‐(Diphenylphosphanyl)phenyl)‐1H‐pyrazole

“…Reacting anhydrous nickel(II) chloride with two equivalents of 3‐(2‐(diphenylphosphanyl)phenyl)‐1 H ‐pyrazole ( 1 )10,11 in methanol gave the dark purple, pentacoordinate nickel(II) complex 2 in good yields (Scheme ).…”

“…Since some years we are interested in aryl phosphines bearing additional heterocyclic groups 10. Such ligands are rapidly accessible by a route that combines the fluoride mediated formation of P–C bonds with (aryl) 2 P(SiMe 3 ) and 1‐ or 4‐fluorophenyl‐3‐dimethylaminoprop‐2‐en‐1‐one as the precursors and a subsequent ring closure reaction with either hydrazine, leading to pyrazoles or guanidines, giving aminopyrimidines (Scheme ) 11…”