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Digitale Medien

Molecular structures of two conjugated ene-ynes derived from thiophene (1996)

Garcia, J. Gabriel ; Liu, Yen-Hsiang ; Fronczek, Frank R.

Springer

Journal of chemical crystallography 26 (1996), S. 607-613

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ISSN: 1572-8854

Schlagwort(e): Thiophene ; conjugated ene-ynes

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract The crystal structures of two conjugated ene-yne derivatives of thiophene are described, 2,5-di-(trimethylsilylethynyl)-3,4-dibromothiophene (1), is triclinic P $$\bar 1$$ witha=6.3281(4)Å,b=9.7421(6)Å,c=16.3669(9)Å; α=80.516(5)°, β=84.810(5)°, γ=74.072(5)°,Z=2,R=0.054; 2,3,4,5-tetra(trimethylsilylethynyl)thiophene (2), is monoclinic, P21/c with a=20.928(2)Å b=5.852(1)Å,c=23.907(2)Å; β=100.245(6)°,Z=4,R=0.049. The ethynylic C atoms of both compounds lie near the thiophene plane, with deviations in the range 0.010(3)–0.455(4)Å. The phenyl groups of2 form a dihedral angle of 13.0(4)°.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01668621

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Digitale Medien

Guayulin B (1999)

Castañeda-Acosta, José ; Fronczek, Frank R. ; Fischer, Nikolaus H.

Springer

Journal of chemical crystallography 29 (1999), S. 107-109

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ISSN: 1572-8854

Schlagwort(e): Guayulin B ; sesquiterpene ; bicyclogermacradiene

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract The sesquiterpene guayulin B, C23H30O3, 1, crystallizes with two independent molecules in monoclinic space group P21 with a = 18.099 (1), b = 6.0649(6), c = 19.126(1) Å, β = 100.82(1)°, V = 2062.1(5) Å3, and Z = 4. The double bonds of the cyclodecadiene ring are E, both methyl groups on the 10-membered ring are β-oriented. The cyclopropane ring at C6 and C7 also has the β orientation, while the anisoyloxy group is oriented α. The 10-membered rings of the two independent molecules have the same conformation as that of guayulin A.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1009587718394

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