ISSN:
1572-8854
Keywords:
Thiophene
;
conjugated ene-ynes
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
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)°.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01668621
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