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
中科院分区:
文献类型:
--
作者:
Z. Hassan;S. Reimann;K. Wittler;R. Ludwig;A. Villinger;P. Langer
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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DOI:
--
发表时间:
1980
期刊:
影响因子:
--
作者:
W. Ried;G. Oremek;Belkis Ocakcioglu
通讯作者:
Belkis Ocakcioglu
DOI:
--
发表时间:
1975
期刊:
影响因子:
--
作者:
T. Higa;A. J. Krubsack
通讯作者:
A. J. Krubsack
DOI:
--
发表时间:
1980
期刊:
影响因子:
--
作者:
W. Ried;G. Oremek;R. Guryn
通讯作者:
R. Guryn
DOI:
--
发表时间:
1967
期刊:
影响因子:
--
作者:
M. S. Simon;J. B. Rogers;W. Saenger;J. Gougoutas
通讯作者:
J. Gougoutas