
TY  - JOUR
A1  - Canty, AJ 
A1  - Minchin, NJ 
A1  - Engelhardt, LM 
A1  - Skelton, BW 
A1  - White, AH 
T1  - <P>Synthetic and Structural Studies of Binuclear Organopalladium(II) Complexes Including a Bis(pyridin-2-yl)phenylmethyl Complex With Four- and Eight-Membered Palladocycle Rings, <I>trans</I>(N,N)-(Pd(&#956;-Py<sub>2</sub>PhC-N,N',C')Cl)<sub>2</sub>.&#189;CH<sub>2</sub>Cl<sub>2</sub>.&#189;Me<sub>2</sub>CO
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1988
VL  - 41
IS  - 5
SP  - 651
EP  - 665
KW  - 
UR  - https://doi.org/10.1071/CH9880651 
N2  - The byridin-2-yl) phenylchloromethanes PyPh2CCl and Py2PhCCl undergo oxidative addition reactions with bis ( dibenzylideneacetone )palladium(0) to form {Pd(PyPh2C) Cl }2 (1) and {Pd(Py2PhC)C}2.½2CH2Cl2.½Me2CO (2), respectively. n.m.r , studies of (1) in CDCl3 indicate presence of an equilibrium between two isomers, involving the ligand (pyridin-2-yl ) diphenylmethyl in &#951;3-coordination, {Pd(&#951;3-PyPh2C)(&#956;- Cl )}2. Complex (2) has two bis (pyridin-2-yl) phenylmethyl groups present as bridging N,C&#8242;- ligands , with the groups also N,C- bidentate to each palladium, to form a binuclear compex containing four- and eight- membered palladocycles: PdC(CN)CNPdC(CN)CNBoth palladium(II) centres in (2) have square-planar 'trans-PdCN2Cl' coordination, so that (2) may be represented as trans(N,N)-{Pd(&#956;- Py2PhC-N,N&#8242;, C&#8242;) Cl }2.½CH2Cl2.½Me2CO. A complex similar to (2), trans(N,N)-{Pd(&#956;- PyPhCH -N,C?)( &#947;mpy ) Cl }2.CH2Cl2 (3), forms on reaction of the lithium derivative of 2-benzylpyridine, Li( PyPhCH ), with dichlorobis (4-methylpyridine)palladium(II); (3) reacts with excess 2-benzylpyridine with displacement of &#947;mpy to form trans(N,N)-{Pd(&#956;- PyPhCH -N,C?)(PyPhCH2) Cl }2 (4). In developing an alternative isolation procedure for (3), involving column chromatography with 4% ethyl acetate in chloroform, the coordination complex trans- bis{1-phenyl-1-(pyridin-2-yl)prop-1-en-2-olato-O,N}palladium(II), Pd{( PyPhC )C(Me)O}2 (5), was isolated in low yield. X-Ray structural studies of (2)-(5) have been completed, with all four complexes crystallizing in the monoclinic system; (2): space group P21/c, a 9.649(6), b 21.116(9), c 18.627(7)&#506;,&#946; 111.42(4)&#176;, Z 4; (3): P21/c, a 13.967(2), b 13.996(3), c 18.886(2)&#506;, &#946; 98.74(1)&#176;, Z 4; (4): P21/n, a 14.274(9), b 14.584(14), c 20.97(2)&#506;, &#946; 109.18(5)&#176;, Z 4; (5): P21/c, a 15.184(3), b 7.887(6), c 19.240(2)&#506;, &#946; 97.51(1)&#176;, Z 4. 
ER  -

