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Titolo:
Synthesis and electrospray mass spectrometry study of Pd(II) complexes of low-rim amino acid substituted calix [4] arenes
Autore:
He, NJ; Liu, F; Mei, YH; Guo, ZJ; Zhu, LG;
Indirizzi:
Nanjing Univ, Inst Coordinat Chem, State Key Lab Coordinat Chem, Nanjing 210093, Peoples R China Nanjing Univ Nanjing Peoples R China 210093 jing 210093, Peoples R China
Titolo Testata:
NEW JOURNAL OF CHEMISTRY
fascicolo: 10, volume: 25, anno: 2001,
pagine: 1330 - 1336
SICI:
1144-0546(200110)25:10<1330:SAEMSS>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
ALKALI-METAL CATIONS; CALIX<4>ARENE TETRAESTERS; PALLADIUM(II) COMPLEXES; PERFORATED MONOLAYERS; HYDROLYTIC CLEAVAGE; CHROMOGENIC LIGANDS; CONTAINING PEPTIDES; AQUA COMPLEXES; CALIXARENES; LITHIUM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Zhu, LG Nanjing Univ, Inst Coordinat Chem, State Key Lab Coordinat Chem, Nanjing 210093, Peoples R China Nanjing Univ Nanjing Peoples R China 210093 093, Peoples R China
Citazione:
N.J. He et al., "Synthesis and electrospray mass spectrometry study of Pd(II) complexes of low-rim amino acid substituted calix [4] arenes", NEW J CHEM, 25(10), 2001, pp. 1330-1336

Abstract

The reactions between Pd(II) and low-rim amino acid substituted calix[4]arenes {L-a = 5,11,17,23-tetra-4-tert-butyl- 25,27-di{[(2'-amino-4 -methylthio)-L-butyryl]aminoethoxyl-26,28-dihydroxycalix[4]arene, L-b = 5,11,17,23-tetra-4-tert-butyl-25,27-di ({[(N-tert-butoxycarbonyl)-2'-amino-4'-methylthio]-L-butyryl}aminoethoxy)-26,28-dihydroxycalix[4]-arene (diN-BOC-L-a) and L-c = 5,11,17,23-tetra-4-tert-butyl-25,27-di{[(N-tert-butoxycarbonyl)-2'-aminoacetyl]aminoethoxyl-26,28-dihydroxycalix[4]arene} were studied by electrospray mass spectrometry. When L-a was refluxed with 2.2 equiv. of trans-[Pd(Py)(2)Cl-2] or 1.1 equiv. of PdCl2, the mononuclear complex (PdLCl2)-Cl-a was formed. When refluxed with 2.2 equiv. of PdCl2, the binuclear complex (Pd2LCl4)-Cl-a was obtained. The same binuclear complex (Pd2LCl4)-Cl-a was also obtained as the final adduct when L-b was refluxed with 3.5 equiv. of PdCl2, during which two BOC groups are removed one-by-one after 6 and 16 h, respectively. However, when L-b was refluxed with trans-[Pd(Py)(2)Cl-2] in methanol, no reaction was observed. In order to understand whether the coordination to Pd(II) of the S atom in methionine is necessary for the removal of BOC groups, the reaction of L-c containing diN-BOC-glycine with PdCl2 was also conducted. The result showed that the BOC groups can also be removedand the Pd(II) complex is not formed until both BOC groups are detached from L-c. These data reveal that the detachment of BOC groups is likely induced by PdCl2, which acts as a Lewis acid during the reaction. This method can be potentially applied to the preparation of analogs of Pd(ii) and other metal complexes of calixarenes substituted at the lower rim by BOC-protected amino acids or peptides without prior treatment of the BOC groups.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 23:52:24