Cyclization of 1,4‐Phenylenediacrylic Acid with Thionyl Chloride and Subsequent Suzuki–Miyaura Reactions Revisited. The Products are Benzo[1,2‐b;5,6‐b′]dithiophenes and not Benzo[1,2‐b;4,5‐b′]dithiophenes

Cyclization of 1,4‐Phenylenediacrylic Acid with Thionyl Chloride and Subsequent Suzuki–Miyaura Reactions Revisited. The Products are Benzo[1,2‐b;5,6‐b′]dithiophenes and not Benzo[1,2‐b;4,5‐b′]dithiophenes
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1,4â苯二丙烯酸与亚硫酰氯的环化和随后的铃木宫浦反应的重新审视产物是苯并[1,2âb;5,6âbâ²]二噻吩而不是苯并[1,2âb;4,5âbâ²]二噻吩

DOI:
10.1002/adsc.201100668
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发表时间:
2012
影响因子:
5.4
通讯作者:
P. Langer
P. Langer
中科院分区:
化学2区
文献类型:
--
作者:
Z. Hassan;S. Reimann;K. Wittler;R. Ludwig;A. Villinger;P. Langer

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重新研究了1,4-苯二丙烯酸与氯化亚砜的反应。在较早的报道中[Liebigs Ann.Chem.1980,1172; Heterocycles 1995,41,2691; Adv. Synth. Catal.2009,351,2683]声称在这些反应中形成了3,7-二氯苯并[1,2-B; 4,5-B′]二噻吩。在此,我们提供了明确的证据,这些结构的分配是错误的,相反,3,6-二氯苯并[1,2-B; 5,6-B′]二噻吩形成。因此,这些母体分子和许多通过Pd催化的交叉偶联反应制备的芳基取代衍生物的结构必须进行修改。由于许多这些二噻吩被报道显示出有趣的光学,热和电子性能,这些性能的理论解释必须重新考虑在这里报道的校正结构的光。我们的结构归属基于母体分子的X射线晶体结构分析和第一不对称衍生物的NMR光谱研究。此外,基于量子化学计算的机理研究已经进行,支持形成3,6-二氯苯并[1,2-B; 5,6-B′]二噻吩异构体。
The reaction of 1,4‐phenylenediacrylic acid with thionyl chloride was reinvestigated. In earlier reports [Liebigs Ann. Chem.1980, 1172;Heterocycles1995,41, 2691;Adv. Synth. Catal.2009,351, 2683] it was claimed that 3,7‐dichlorobenzo[1,2‐b;4,5‐b′]dithiophenes were formed in these reactions. Herein, we provide unambiguous evidence that the assignment of these structures is wrong and that, in contrast, 3,6‐dichlorobenzo[1,2‐b;5,6‐b′]dithiophenes are formed. As a consequence, the structures of these parent molecules and of numerous aryl‐substituted derivatives prepared by Pd‐catalyzed cross‐coupling reactions have to be revised. As many of these dithiophenes were reported to show interesting optical, thermal and electronic properties, the theoretical explanations for these properties have to be reconsidered in the light of the corrected structures reported herein. Our structural assignments are based on X‐ray crystal structure analyses of the parent molecules and on NMR spectroscopic studies of the first unsymmetrical derivatives. Besides, mechanistic investigations based on quantum chemical calculations have been carried out which support the formation of the 3,6‐dichlorobenzo[1,2‐b;5,6‐b′]dithiophene isomers.
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发表时间: 1980
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叔胺存在下亚硫酰氯与羧酸的新反应。α-氯-α-氯硫基-4-硝基-2,5-二甲氧基苯乙酰氯结构的 X 射线晶体学证明。
DOI: --
发表时间: 1967
期刊:
影响因子: --
作者:
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