Methyl(2-phosphanylphenolato[P,O])nickel(II) Complexes – Synthesis, Structure, and Activity as Ethene Oligomerization Catalysts

✍ Scribed by Joachim Heinicke; Mengzhen He; Attila Dal; Hans-Friedrich Klein; Olaf Hetche; Wilhelm Keim; Ulrich Flörke; Hans-Jürgen Haupt

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 404 KB
• Volume: 2000
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/(sici)1099-0682(200003)2000:3<431::aid-ejic431>3.0.co;2-q

✦ Synopsis

Reactions of various substituted 2-phosphanylphenols 1a-f with half-molar amounts of cis-[MeNi(µ-OMe)(PMe 3 )] 2 have been found to yield square-planar methyl(2-phosphanylphenolato)(trimethylphosphane)nickel(II) complexes 2a-f. 2 J PP coupling constants of 305-316 Hz at low temperature indicate a trans-configuration for the products, while broad 31 P-NMR signals at room temperature can be attributed to rapid dissociation of PMe 3 . Reaction with excess 1 gave rigid bis(2-phosphanylphenolato)nickel(II) complexes as exemplified by 3e, whereas addition of PMe 3 to 2a led to the pentacoordinate methyl(2-phosphanylphenolato)bis(trimethylphosphane)nickel(II) complex 4a. Higher yields of 4a and 4d