Reactions of transition-metal .sigma.-acetylide complexes. 2. Cycloaddition and subsequent reactions of tetracyanoethylene with some (.eta.-cyclopentadienyl)ruthenium-tertiary phosphine complexes: x-ray structure of Ru{C[:C(CN)2]CPh:C(CN)2}(dppe)(.eta.-C5H5).cntdot.0.5CHCl3

1985 ◽  
Vol 4 (3) ◽  
pp. 501-508 ◽  
Author(s):  
Michael I. Bruce ◽  
Trevor W. Hambley ◽  
Michael R. Snow ◽  
A. Geoffrey. Swincer
Keyword(s):  
Transition Metal ◽  
Tertiary Phosphine ◽  
X Ray ◽  
Phosphine Complexes

scholarly journals Peripherally-metallated porphyrins: meso-η1-porphyrinyl-platinum(II) complexes of 5,15-diaryl- and 5,10,15-triarylporphyrins

2002 ◽  
Vol 06 (11) ◽  
pp. 695-707 ◽  
Author(s):  
Regan D. Hartnell ◽  
Alison J. Edwards ◽  
Dennis P. Arnold
Keyword(s):  
Oxidative Addition ◽  
Building Blocks ◽  
Molecular Structures ◽  
Porphyrin Ring ◽  
Tertiary Phosphine ◽  
X Ray ◽  
Ring Carbon ◽  
X Ray Crystallography ◽  
Phosphine Complexes ◽  
Organolithium Reagents

Attempted metathesis reactions of peripherally-metallated meso-η1-porphyrinylplatinum(II) complexes such as trans-[ PtBr ( NiDPP )( PPh 3)2]( H 2 DPP = 5,15- diphenylporphyrin ) with organolithium reagents fail due to competitive addition at the porphyrin ring carbon opposite to the metal substituent. This reaction can be prevented by using 5,10,15-triarylporphyrins, e.g. 5,10,15-triphenylporphyrin ( H 2 TrPP ) and 5-phenyl-10,20-bis(3′,5′-di-t-butylphenyl)porphyrin ( H 2 DAPP ) as substrates. These triarylporphyrins are readily prepared using the method of Senge and co-workers by addition of phenyllithium to the appropriate 5,15-diarylporphyrins, followed by aqueous protolysis and oxidation. They are convenient, soluble building blocks for selective substitutions and subsequent transformations at the remaining free meso carbon. The sequence of bromination, optional central metallation and oxidative addition of Pt (0) tris(phosphine) complexes generates the organoplatinum porphyrins in high overall yields. The bromo ligand on the Pt (II) centre can be substituted by alkynyl nucleophiles, including 5-ethynyl NiDPP , to form the first examples of meso-η1-porphyrinylplatinum(II) complexes with a second Pt - C bond. The range of porphyrinylplatinum(II) bis(tertiary phosphine) complexes was extended to the triethylphosphine analogues, by oxidative addition of H 2 TrPPBr to Pt ( PEt 3)3, and the initially-formed cis adduct is only slowly thermally transformed to trans-[ PtBr ( H 2 TrPP )( PEt 3)2]16. The molecular structures of NiDAPP 9b, trans-[ Pt ( NiDPP )( C 2 NiDPP )( PPh 3)2]14 and 16 were determined by X-ray crystallography.

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