Separating the Racemic and Meso Diastereomers of a Binucleating Tetraphosphine Ligand System through the Use of Nickel Chloride
The reaction of a 1:1 mixture of rac- and meso-et,ph-P4 (et,ph-P4 = (Et2PCH2CH2)(Ph)PCH2P(Ph)CH2CH2PEt2) with 2 equiv of NiCl2·6H2O in EtOH produces soluble rac-Ni2Cl4(et,ph-P4) and precipitates meso-Ni2Cl4(et,ph-P4), allowing facile isolation of each bimetallic complex. Subsequent reaction with mor...
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Published in | Inorganic chemistry Vol. 40; no. 19; pp. 5036 - 5041 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
United States
American Chemical Society
10.09.2001
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Online Access | Get full text |
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Summary: | The reaction of a 1:1 mixture of rac- and meso-et,ph-P4 (et,ph-P4 = (Et2PCH2CH2)(Ph)PCH2P(Ph)CH2CH2PEt2) with 2 equiv of NiCl2·6H2O in EtOH produces soluble rac-Ni2Cl4(et,ph-P4) and precipitates meso-Ni2Cl4(et,ph-P4), allowing facile isolation of each bimetallic complex. Subsequent reaction with more than 250 equiv of NaCN in H2O/MeOH releases the et,ph-P4 ligand and [Ni(CN)4]2-. The rac,trans- and meso,trans-Ni(CN)2(η2.5-et,ph-P4) form as intermediates in the cyanolysis of rac- and meso-Ni2Cl4(et,ph-P4). These have been characterized by X-ray crystallography. The unusual partial isomerization of the meso- to rac-et,ph-P4 ligand via the monometallic trans-Ni(CN)2(η2.5-et,ph-P4) intermediate complex is discussed. |
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Bibliography: | istex:019DF917F8D6CAADEA5AB0A12D7AEDDBD419A9A4 ark:/67375/TPS-Q3PG2JZH-R ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0020-1669 1520-510X |
DOI: | 10.1021/ic010035f |