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KMID : 1059519920360040536
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Journal of the Korean Chemical Society
1992 Volume.36 No. 4 p.536 ~ p.539
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Structure of a Spiro Orthocarbonate, 3,3'-Spirobi[1H, 5H-naphtho [1,8-ef] [1,3] dioxocin]
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Song Young-Mi
Shin Jung-Mi
Park Young-Ja
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Abstract
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Eight-membered ring spiro orthocarbonate (C25H20O4, Mr = 384) is monoclinic, space group C2/c, with a = 15.319(4), b = 9.057(3), c = 13.168(3)Å β = 98.53(3)°, Z = 4, F(000) = 808, T = 290 K, μ(Mo-Kα) = 0.55 cm-1, Dc = 1.36 g/cm3 and Dm = 1.40 g/cm3. The intensity data were collected with Mo-Kα radiation (λ = 0.7107 Å) on an automatic four-circle diffractometer with a graphite monochromater. The structure was solved by direct methods and refined by full matrix least-squares methods. The final R value was 0.052 for 1412 observed reflections. The molecule has C2 point symmetry. The eight-membered ring has a chair conformation with pseudo-Cs symmetry. The naphthyl ring is planar with the C-C bond lengths being in the range of 1.352∼1.444Å and bond angles of 117.2∼123.5°. The bond lengths of C(1)-C(9), C(8)-C(9) and C(9)-C(10) are somewhat longer than those of the other C-C bonds.
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