Achieving a Favorable Activation of the C–F Bond over the C–H Bond in Five- and Six-Membered Ring Complexes by a Coordination and Aromaticity Dually Driven Strategy

2021 ◽  
Author(s):  
Yuanyuan Li ◽  
Jun Zhu
Keyword(s):  
Membered Ring ◽  
Ring Complexes

scholarly journals Carbonylniobium Chemistry, IV Derivatives of η5 -C5H5Nb(CO)4 with Tridentate Phosphines

1983 ◽  
Vol 38 (4) ◽  
pp. 446-448 ◽  
Author(s):  
Martin Hoch ◽  
Dieter Rehder
Keyword(s):  
Nmr Spectra ◽  
Membered Ring ◽  
Vanadium Complexes ◽  
Ring Complexes ◽  
Derivatives Of ◽  
Induced Reaction

Abstract The photo-induced reaction between CpNb(CO)4 and Ph2P(CH2)2PR(CH2)2PPh2 (L; R = Ph, Cy) yields the chelated five-membered ring complexes cis-[CpNb(CO)2L] (two isomers in the case of R = Cy). The uncordinated PPh2 group reacts with CpNb(CO)3THF to form CpNb(CO)2(μ-L)CpNb(CO)3. IR, 31P and 93Nb NMR spectra are discussed and compared with corresponding data of the analogous vanadium complexes.

Palladium(II) Complexes with Dithiomalonamide and N,N′-Diphenyldithiomalonamide

1974 ◽  
Vol 52 (20) ◽  
pp. 3454-3458 ◽  
Author(s):  
Gian Carlo Pellacani
Keyword(s):  
Electronic Spectra ◽  
Bidentate Ligand ◽  
Membered Ring ◽  
Orbital Parameters ◽  
Square Planar ◽  
Anionic Ligands ◽  
Ligand Coordination ◽  
Ring Complexes ◽  
Square Planar Complexes ◽  
Spectrochemical Series

Dithiomalonamide (Hdtma) and N,N′-diphenyldithiomalonamide (Hdpma) form diamagnetic square-planar complexes PdL2 and PdL2•2DMF. For these complexes a [PdS4] coordination was suggested by their electronic and i.r. spectra. The splitting orbital parameters, Δ1, indicates that these anionic ligands assume an intermediate position in the spectrochemical series of sulfur donors. These ligands also form Pd(HL)2X2 (X = Cl, Br, I, ClO4) and PdHLX2 (X = Cl, Br, I) complexes in which spectroscopic evidence suggests an S,N bidentate ligand coordination, forming six-membered rings. ν(PdN) and ν(PdS) are tentatively assigned. For Pd(Hdpma)2X2 complexes from the far i.r. and electronic spectra we propose a cis-PdN2S2 configuration. The Δ1 parameters in the six-membered ring Pd(HL)2X2 complexes indicate a ligand strength greater than in the analogous S,N coordinated five-membered ring complexes of dithiooxamides and show an inversion of the order found in Ni(HL)2X2 (HL = Hdtma, Hdpma) complexes. In PdHLX2 complexes the presence of two bands assignable to Vasym(PdX) and Vsym(PdX) supports a cis-halogen configuration.

scholarly journals Insertion of zinc into the cyclophosphazene skeleton: synthesis and structure of six-membered-ring complexes of zinc

1993 ◽  
Vol 32 (24) ◽  
pp. 5444-5446 ◽  
Author(s):  
Sushil K. Pandey ◽  
Alexander Steiner ◽  
Herbert W. Roesky ◽  
Dietmar Stalke
Keyword(s):  
Membered Ring ◽  
Ring Complexes

Multiple bonds between lead atoms and short bonds between transition metals

2012 ◽  
Vol 85 (4) ◽  
pp. 649-659 ◽  
Author(s):  
Shigeru Nagase
Keyword(s):  
Double Bond ◽  
Transition Metal ◽  
Transition Metals ◽  
Triple Bond ◽  
Membered Ring ◽  
Heterocyclic Carbenes ◽  
Multiple Bonds ◽  
Ring Complexes

The heaviest analogues of alkynes are investigated to realize a short triple bond between Pb atoms. For a short double bond between Pb atoms, the Pb2 molecule stabilized by dative N-heterocyclic carbenes is investigated. For unsupported and supported short bonds between transition metals, two-coordinate transition-metal and bicyclic four-membered ring complexes are investigated.

Sign in / Sign up

Export Citation Format

Share Document