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Differential reactivity of SH bonds towards platinum(0). Direct synthesis of a low symmetry platinum (II) complex with hydrido, phosphine andN,S-cysteinato ethyl ester ligands

Authors
Journal
Inorganic Chemistry Communications
1387-7003
Publisher
Elsevier
Publication Date
Volume
1
Issue
12
Identifiers
DOI: 10.1016/s1387-7003(98)00122-1
Keywords
  • Platinum Complexes
  • Cysteine Complexes
  • Hydrido Complexes

Abstract

Abstract The chelate assisted oxidative addition of the HS bond of L-cysteine esters HSCH 2C ∗H(COOR)NH 2 (R = Me, Et), to Pt(PPh 3) 4 yields the low symmetry cysteine complexes [Pt(H)(SCH 2C ∗H(COOR)NH 2)(PPh 3)] in one step, with displacement of three moles of triphenylphosphine, only when an excess of the cysteine ester is used. With HSCH 2CH 2NH 2 the excess is not necessary: the 1:1 reaction yields [Pt(H)(SCH 2CH 2NH 2)(PPh 3)]. Bulkier HSCH 2CH 2NMe 2 and HSCMe 2CH(COOMe)NH 2 (penicillamine methyl ester) do not react, even when an excess of ligand is used. 2-Aminothiophenol gives trans-[Pt(H)(SC 6H 4-2-NH 2)(PPh 3) 2] and does not form a chelate complex.

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