百度作业网化学英语在线翻译 请帮帮忙
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化学英语在线翻译 请帮帮忙
Figure 1. ORTEP drawing of 7 at the 50% probability level. C1\3C9 1.332(7), C2\3C3 1.468(7), C2\3C8 1.322(8), S2\3C8 1.705(6),
S3\3C10 1.747(5), C10\3C13 1.337(8) A, . The torsion angle between the pyridine and the dithiole rings is 25.9°.
problems owing to undesired donor–acceptor interactions
either at stages preceding the chemical linking or
during isolation of the final product.2
One of the strongest acceptors used for linking with the
TTF moiety, by a unique approach, is the N-alkyl
pyridinium cation in a TTF-sigma spacer-Py+ system.3
Derivatives involving both TTF and Py+ moieties are
excellent models for studying ICT versus ET processes
since the formation of the strong accepting moiety
occurs on the very last stage of the synthesis, and under
mild and controllable conditions.
Recently a TTF-p-spacer-Py+ system with an ethenyl p
spacer was prepared.4 In the present communication we
report a simple synthetic route for the synthesis of a
D–A system in which the TTF moiety is directly linked
to the pyridinium cation moiety, without any spacer,
according to Scheme 1. Attempts to apply the known
procedure described for the synthesis of aryl substituted
1,3-dithiole-2-thiones from the corresponding 1,3-dithiole-
2-(N-diethyl)immonium salt5 for the key precursor,
4-(4%-pyridyl)-1,3-dithiole-2-thione 5, have been unsuccessful.
However, the cyclization of 3 in concentrated
sulfuric acid afforded 1,3-dithiole-2-one derivative 4 in
70% yield. Derivative 5 can be obtained in 65–70%
yields upon treatment with phosphorus sulfide. Although
the coupling between 5 and 4,5-dimethylthio-
1,3-dithiole-2-thione6 with triethyl phosphite gives the
unsymmetrical TTF derivative 7 in low yields along
with symmetrical derivatives, chromatographic separation
is simple due to the large difference in Rf of the
products. Long chain substituted alkylthio substituted
derivatives can also be easily prepared according to the
above protocol (for instance, the 2,3-dihexadecylthio
derivative of 7 in 12% yield).
Figure 1. ORTEP drawing of 7 at the 50% probability level. C1\3C9 1.332(7), C2\3C3 1.468(7), C2\3C8 1.322(8), S2\3C8 1.705(6),
S3\3C10 1.747(5), C10\3C13 1.337(8) A, . The torsion angle between the pyridine and the dithiole rings is 25.9°.
problems owing to undesired donor–acceptor interactions
either at stages preceding the chemical linking or
during isolation of the final product.2
One of the strongest acceptors used for linking with the
TTF moiety, by a unique approach, is the N-alkyl
pyridinium cation in a TTF-sigma spacer-Py+ system.3
Derivatives involving both TTF and Py+ moieties are
excellent models for studying ICT versus ET processes
since the formation of the strong accepting moiety
occurs on the very last stage of the synthesis, and under
mild and controllable conditions.
Recently a TTF-p-spacer-Py+ system with an ethenyl p
spacer was prepared.4 In the present communication we
report a simple synthetic route for the synthesis of a
D–A system in which the TTF moiety is directly linked
to the pyridinium cation moiety, without any spacer,
according to Scheme 1. Attempts to apply the known
procedure described for the synthesis of aryl substituted
1,3-dithiole-2-thiones from the corresponding 1,3-dithiole-
2-(N-diethyl)immonium salt5 for the key precursor,
4-(4%-pyridyl)-1,3-dithiole-2-thione 5, have been unsuccessful.
However, the cyclization of 3 in concentrated
sulfuric acid afforded 1,3-dithiole-2-one derivative 4 in
70% yield. Derivative 5 can be obtained in 65–70%
yields upon treatment with phosphorus sulfide. Although
the coupling between 5 and 4,5-dimethylthio-
1,3-dithiole-2-thione6 with triethyl phosphite gives the
unsymmetrical TTF derivative 7 in low yields along
with symmetrical derivatives, chromatographic separation
is simple due to the large difference in Rf of the
products. Long chain substituted alkylthio substituted
derivatives can also be easily prepared according to the
above protocol (for instance, the 2,3-dihexadecylthio
derivative of 7 in 12% yield).
图1 .ORTEP图7在50 ％的概率水平.的C1碳九1.332 （ 7 ） ,C2体C3 1.468 （ 7 ） ,C2的C8 1.322 （ 8 ） ,中二的C8 1.705 （ 6 ） ,
三C10 1.747 （ 5 ） ,C10 C13 1.337 （ 8 ） ,.扭转夹角吡啶和dithiole环是25.9 ° .
问题由于不受欢迎的捐助者受体相互作用
无论是前阶段的化学联系或
隔离期间的最后product.2
其中一支最强大的用于连接受体的
转录因子成分,以独特的方式,是N -烷基
吡啶阳离子的转录因子- ∑间隔疗法+ system.3
四硫富瓦烯衍生物涉及和芘+基是
良好的学习模式的信息和通信技术相素进程
成立以来接受的强烈基
发生在最后阶段的合成,并根据
轻度和可控条件.
最近,一个转录因子的P -间隔疗法+系统与乙烯基p
三C10 1.747 （ 5 ） ,C10 C13 1.337 （ 8 ） ,.扭转夹角吡啶和dithiole环是25.9 ° .
问题由于不受欢迎的捐助者受体相互作用
无论是前阶段的化学联系或
隔离期间的最后product.2
其中一支最强大的用于连接受体的
转录因子成分,以独特的方式,是N -烷基
吡啶阳离子的转录因子- ∑间隔疗法+ system.3
四硫富瓦烯衍生物涉及和芘+基是
良好的学习模式的信息和通信技术相素进程
成立以来接受的强烈基
发生在最后阶段的合成,并根据
轻度和可控条件.
最近,一个转录因子的P -间隔疗法+系统与乙烯基p