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- W2073353378 abstract "Triorganotin and triorganolead derivatives of glutamic acid (H2Glu) and aspartic acid (H2Asp) (R3M)2Glu (M = Sn, R = Me, Ph; M = Pb, R = Ph) and R3SnHL (L = Glu, R = Me, n-Bu; L = Asp, R = Me) have been prepared from R3MOH or (n-Bu3Sn)2O and the amino acid. Methanolysis of (R3Sn)2L also produces R3SnHL. The crystal structure of trimethyltin glutamate Me3ShHGlu has been determined by single crystal X-ray diffraction. Tin is in a slightly distorted trigonal bipyramidal environment with Me in equatorial positions. The axial positions are occupied by oxygen atoms of the monodentate carboxylate groups (OSnO 174.8(2)°; SnO 2.222(3), 2.301(3) Å) such as to form a helical chain. Hydrogen bonds link the NH3+ group to the four carboxylate oxygen atoms (N · O 2.601(4) to 2.797(6) Å). The intramolecular hydrogen bonds appear to stabolize the helical structure, the helices being associated by the intermolecular hydrogen bonds. From IR data analogous molecular structures are inferred for the other R3SnHL derivatives. (Ph3Sn)2Glu is monomeric and contains monodentate carboxylate groups, while for (Me3Sn)2Glu and for (Ph3Pb)2Glu obtained from methanol a polymeric structure with MNH2-coordination and both mono- and bi-dentate carboxylate groups are proposed. An isomeric compound (Ph3Pb)2Glu having a different polymeric structure was obtained from benzene." @default.
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- W2073353378 date "1989-04-01" @default.
- W2073353378 modified "2023-09-23" @default.
- W2073353378 title "Triorganotin and triorganolead derivatives of glutamic and aspartic acid. Crystal structure of trimethyltin glutamate" @default.
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- W2073353378 doi "https://doi.org/10.1016/0022-328x(89)87172-4" @default.
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