Dimethylzink reagiert mit den chiralen Aminoalkoholen (S)‐N‐Methyl‐pyrrolidinyl‐2‐methanol, (R/S)‐ 1‐Phenyl‐2‐(N‐methylamino)‐ethanol und (S)‐α,α‐Diphenylpyrrolidinyl‐2‐methanol jeweils im Molverhältnis 1 : 1 zu den entsprechenden Methylzinkaminoalkoxiden 1–3. 1 und 2 sind trimer, 3 dimer aufgebaut. Als Folge der Zn–N‐Wechselwirkung entstehen neue Chiralitätszentren mit asymmetrisch umgebenen N‐Atomen bei gleichzeitiger Ausbildung von Chelatringsystemen. Eine nähere Charakterisierung von 1–3 erfolgte mittels ihrer 1H‐, und 13C‐NMR‐Spektren, sowie durch Röntgenkristallstrukturuntersuchungen.
Chiral dimethylindiumaminoalkoxides of general formula Me21nOR* [OR' = (+);(-)-2piperidyl-methoxy (11, (+);(-)-dimethylamino-2-propoxy (21, (S)-(+)-amino-2-propoxy (31, (3-n, a-diphenyl-2-pyrrolidinyl-methoxy (411 have been prepared by reaction of MeJn with the corresponding aminoalcohols HOR* and characterized by 'H and I3C nmr spectroscopy and X-ray crystallography. Dimeric molecules of 1-4 are composed of two p2-O-bridged chelating rings, the latter formed due to N-In donor-acceptor interaction. This geometry is comparable with that of aluminium and gallium analogues previously investigated. In the case of 1 and 4, the formation of the N-In bond proceeds stereospecifically. The absolute structure of 3 and 4 was confirmed by refinement of the Flack parameter.1: C2/rn; a = 15.999(3) A, b = 9.803(2) A, c = 7.410(1) A, = 111.04(3)"; Z = 2; density (calc.) 2: C2/c; a = 13.184(3) A, b = 9.987(2) A, c = 15.851(3) A, p = 90.66(3)"; Z = 4; density (calc.
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