Linked Life Data

18189351

Source:http://linkedlifedata.com/resource/pubmed/id/18189351

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2008-2-11
pubmed:abstractText
Stepwise modulation of the ring size of metallacyclic compounds via subtle ring-constraint effects has been established. The reactions of (COD)PdCl 2 with p- or m-psb ligand [COD = 1,5-cyclooctadiene; p-psb = 1,4-bis(dimethyl-4-pyridylsilyl)benzene; m-psb = 1,4-bis(dimethyl-3-pyridylsilyl)benzene] in a mixture of acetone and ethanol at room temperature produce the metallacyclodimers [PdCl 2( p- or m-psb)] 2. The cyclodimeric species of [PdCl 2( p-psb)] 2 at the boiling temperature or via the sonication of the chloroform solution is completely converted to the cyclotrimer [PdCl 2( p-psb)] 3. Direct reaction of (COD)PdCl 2 with p-psb in a mixture of acetone and ethanol at reflux temperature yields the same trimer, [PdCl 2( p-psb)] 3. Furthermore, equilibria between the kinetic product, [PdCl 2( p-psb)] 2, and the thermodynamic product, [PdCl 2( p-psb)] 3, have been observed in N, N-dimethylformamide as well as in dimethyl sulfoxide. In contrast, the cyclodimeric structure of [PdCl 2( m-psb)] 2 is retained under the same treatment conditions for 40 h; that is, the trimeric species, [PdCl 2( m-psb)] 3, is not formed. Such a notable difference between [PdCl 2( p-psb)] 2 and [PdCl 2( m-psb)] 2 might be explained by their different angle constraints.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0020-1669
pubmed:author
pubmed:issnType
Print
pubmed:day
18
pubmed:volume
47
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1391-6
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Subtle ring-constraint effects on the formation of metallacycles. Cyclodimer versus cyclotrimer of bis(chloro)-1,4-bis(dimethyl-3 or 4-pyridylsilyl)benzenepalladium(II) complexes.
pubmed:affiliation
Department of Chemistry and Center for Plastic Information Systems, Pusan National University, Pusan, Korea.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't