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- W2019950823 abstract "The crystal structure of (Z,Z,Z)-19, 24-dihydro-1-methoxy-19-oxo-2,7,13,18-tetramethyl-3,8,12, 17-tetraethyl-22H-bilin was determined at 101 K by X-ray diffraction methods: space group PĪ, a = 9.532(2), b = 12.189(4), c = 13.984(4)Å, α = 114.83(3),β = 103.56(2), γ = 90.55(1)°, Z = 2 (C32H40N4O2), Dx =1.197 g cm−3. Intensity data were collected up to sin θ/λ= 0.765, which permitted anisotropic refinement of all non-hydrogen atoms and isotropic refinement of all hydrogen atoms. The lactim ether exists as the 22H,24H tautomer in the crystal, and assumes a quasi-helical conformation with a CO ⋯ O-Me distance of 3.94å. Molecular conformation and tautomeric form are discussed in terms of intramolecular hydrogen bonding between pyrrole hydrogen atoms and pyrrolenine nitrogen atoms. The molecular conformation in the crystal shows excellent agreement with the result of previous studies in solution." @default.
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- W2019950823 date "1983-01-01" @default.
- W2019950823 modified "2023-09-25" @default.
- W2019950823 title "Crystal structure of the mono-lactim ether of a bilatriene-abc derivative at 101 k" @default.
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- W2019950823 doi "https://doi.org/10.1016/s0040-4020(01)88699-3" @default.
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