Graphdiyne (1) is a member of a novel family of interesting and potentially important allotropes of carbon. Reported herein are the synthesis and spectroscopic characterization of model substructures 2-6. The macrocycles were prepared by the intramolecular cyclization of suitable alpha,omega-polyynes. Key to the success of this approach was the development of an in situ protiodesilylation/alkynylation
Dehydro[12]- and -[18]annulenes 3 and 4 fused with tetrafluorobenzene were newly synthesized by the copper-mediated oxidative coupling of 1,2-diethynyltetrafluorobenzene. The UV-vis spectra of 3 and 4 showed the maximum absorption to be almost identical to that of the corresponding unsubstituted benzodehydro[12]- and -[18]annulenes 1 and 2, respectively, while the reduction waves in cyclic voltammetry
通过铜介导的1,2-二乙炔基四氟苯的氧化偶联,新合成了与四氟苯稠合的脱氢[12]-和-[18]环戊烯3和4。3和4的UV-vis光谱显示最大吸收分别与相应的未取代的苯并氢[12]-和-[18]环戊烯1和2几乎相同,而在循环伏安法中在电位下观察到还原波-3和4的-1.48和-1.56 V vs Fc / Fc(+)的负值小于1和2的负值。与这些结果一致,理论计算(B3LYP / 6-31G(d))表明,HOMO -LUMO间隙对于1和3以及对于2和4是相似的,但是3和4的LUMO水平明显被负电性氟取代基降低。从3(晶体A),3生长的单晶的X射线晶体学。C(6)H(6)(晶体B)和1和3的混合物(晶体C)表明,3的分子以倾斜的方式堆叠在晶体A和B中,而1和3的分子形成三明治状。 1:2的络合物(3.1.3)以柱状排列堆叠在晶体C中。尽管适用于拓扑化学聚合的填料,晶体AC还是很稳定的抗光化学反应
Haley, Michael M.; Brand, Stephen C.; Pak, Joshua J., Angewandte Chemie - International Edition in English, 1997, vol. 36, # 8, p. 835 - 838
作者:Haley, Michael M.、Brand, Stephen C.、Pak, Joshua J.
DOI:——
日期:——
A versatile synthetic route to dehydrobenzoannulenes via in situ generation of reactive alkynes
作者:Michael L Bell、Ryan C Chiechi、Charles A Johnson、David B Kimball、Adam J Matzger、W Brad Wan、Timothy J.R Weakley、Michael M Haley
DOI:10.1016/s0040-4020(01)00229-0
日期:2001.4
This paper outlines the development of a protocol that allows in situ generation of unstable alkynes under Pd-catalyzed cross-coupling conditions. Cu-mediated intramolecular cyclization of the resultant alpha,omega -polyynes provides dehydrobenzoannulenes as singular species, in very good overall yields, and in a variety of topologies that are inaccessible by traditional routes or previously available in low yield only. In addition, we will discuss the solid-state structure and reactivity of these macrocycles, as well as the ability of the planar dehydrobenzoannulenes to support weak induced ring currents. (C) 2001 Elsevier Science Ltd. All rights reserved.