ISSN:
1572-8854
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Abstract Δ1(6)-Dehydrosparteinium monoperchlorate, [C15H25N2]+·ClO 4 − , is orthorhombic∶P212121,a=12.473(2),b=24.292(3),c=10.835(1) Å,V c =3353.7(9) Å3,Z=8,D x =1.32,D m =1.32 g cm−3, μ(CuKα)=20.7 cm−1. The finalR was 0.097 for 2091 observed counter reflections. A partial disorder of the crystal structure has been observed. The two independent perchlorate anions are orientationally disordered, and the peripheral atoms in the cation skeletons have large temperature factors due both to conformational disorder of ringsA and to disordered orientations of the whole cations alike. In ringsA, atoms C(3) and C(4), trans-annular to the immonium bond, are disordered to a different extent in each of the two independent cations. RingsB,C, andD have sofa (distorted towards half-chair), chair, and chair conformations, respectively. The quinolizidinium and quinolizidine moieties have planar and cis configurations, respectively. The title compound was obtained from Δ5-dehydrosparteine, the product of mercuric acetate dehydrogenation of sparteine at room temperature. From13C NMR measurements in2H2O and in DMSO-2H6 it is evident that, in solution, the molecular geometry with chair/chair cis-ring fusion within the quinolizidine moiety is present, as was found in the crystalline state by X-ray analysis.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01161107
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