• Umlagerungsreaktionen von Metallodiphosphapropenen des Typs (rj 5-C 5 Me 5)-Contents (Continued) Querverweise / Cross References

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The α-iminocarboxylato chelate complexes RuH(CO)[OOC-C(R1)=N-R2](PPh3)2 (1), η6-p-cymene)RuCl[OOC-C(R)=N-CH2CO2Me] (3) and Cp*CoI[OOC-C(R1)= N-R2] (4) have been obtained from RuHCl(CO)(PPh3)3, [(η6-p-cymene)RuCl2] and Cp*Co(CO)I2, respectively and 2-oxocarboxylate/amine. The structure of (η6-p-cymene)RuCl[OOC-C(CH3)= N-CH2CO2Me] (3a) has been determined by X-ray diffraction. By use of diamines the corresponding dinuclear cobalt and iridium complexes (5, 6) are formed from 2-oxocarboxylate and Cp*Co(CO)I2 or [Cp*IrCl2]2.

Die iodoverbrückten Komplexe [(η5‐C5H5)Mo(NO)I2]2 setzen sich mit Glycinat, D‐Phenylglycinat, L‐Prolinat und L‐Azetidin‐2‐carboxylat zu den chiralen Chelat‐Komplexen (η5‐C5H5)(ON)(I)Mo(α‐Aminocarboxylat) um, die als Mischung von Isomeren entstehen. Die Röntgenstrukturanalyse eines Kristalls von zeigt die trans‐Konfiguration der Amino‐ und Nitrosyl‐Liganden in einer tetragonalen Pyramide.

Organometallic dipeptide ester complexes of the general formula [ (L)M(CI)(K'-NHZCH~CONCH,CO,R)] (1: L = Cp*, M = Rh, 2: L = Cp*, M = Ir, 3: L = q6-C6Me6, M = Ru) react smoothly with various a-L-amino acid esters in the presence of NEt, to yield the tripeptide ester complexes [(L)M(CI)(K'- NH,CHR'CONCH,CONHCH,CO,R)](5-7). In the same fashion chloro K 'tetrapeptide ester complexes 10 and 11 are obtained either from tripeptide ester com-plexes or by subsequent addition of two equivalents of amino acid ester to a dipeptide ester complex. When the strong base NaOMe is used in the reaction of the diglycine ester compounds with amino ~ 1520 - . 0-69451 Weinheim. 1996 0947-6S39/96/0212-IS20 d IS.O0+.2S/O Chem. Eur. J. 1996, 2. No. I2 Oligopeptide Synthesis 151 8 -1 526 Chem. Eur. 1. 1996, 2, No. 12 Q VCH Verlagsgesellschaff mhH. D-69451 Weinheim. 1996 0947-6539/96/0212-l521 S 15.00+.25/0 63 VCH VerlaPsPesellscha/r mbH, 0.69451 Weinheim, 19% 09474539/96/0212-1522 d I5.OOi.25lO