6]fullerene-C60-Ih (1) with some anthracenes were prepared highly regioselectively by heating mixtures of the solid1 and anthracene or of (one of) three alkyl-substituted anthracenes in the absence of solvents (Scheme 2). Other bis-cycloadducts were not detected, but lesser amounts of mono-cycloadducts 2 and 4 – 6, respectively, were also formed. Heating of solvent-free mixtures of 1 and three other alkyl-substituted
The attempt to elaborate organic materials at the nanoscale has attracted broad attention in the last few years. Here, we report the synthesis and characterization of new polypedic organic materials possessing the [60]fullerene as the three-dimensional rigid scaffold. High molecular weight hexakisadducts with different symmetries were obtained in 40 to 60% yield through modulations of the A. Hirsch's and B. Kraütler's methodologies. Such a regioselective grafting of side-connected malonates on C60 put in evidence that not only the size but also the nature of the malonate influences very strongly the optimal reaction conditions to the preparation of multiadducts with very good yields. Characterization was complemented by an investigation of their thermotropic behaviour. Starting from non-mesogenic precursors, the 3D organization stemming from the regioselective polyfunctionalization of the carbon nanosphere allowed highlighting an original nematic self-organization (no literature equivalent) which could be partially oriented under a magnetic field at room temperature.
过去几年中,在纳米尺度上精心制作有机材料的尝试引起了广泛关注。在此,我们报告了以 [60] 富勒烯为三维刚性支架的新型多肽有机材料的合成和表征。通过修改 A. Hirsch 和 B. Kraütler 的方法,我们获得了具有不同对称性的高分子量六烷基加合物,产率为 40% 至 60%。在 C60 上进行侧连接丙二酸盐的这种区域选择性接枝证明,丙二酸盐的大小和性质对制备多加成物的最佳反应条件有很大影响,而且产率非常高。除了表征之外,还对它们的趋热行为进行了研究。从非介电前体开始,碳纳米圈的区域选择性多官能化产生的三维组织使其突出了一种原始的向列自组织(无文献对应),在室温磁场下可部分定向。
Supramolecular Subphthalocyanine Cage as Catalytic Container for the Functionalization of Fullerenes in Water
作者:Ainhoa Salazar、Marta Moreno‐Simoni、Sunit Kumar、Jorge Labella、Tomás Torres、Gema de la Torre
DOI:10.1002/anie.202311255
日期:2023.10.26
has been shown to catalyze the Diels–Alderreaction between C60 and anthracene in water to yield mono- and bis-adducts with high regioselectivity. Catalytic amounts of the cage led to better conversions because it favours co-encapsulation of the substrates in the hydrophobic cavity. Moreover, the larger binding affinity of the cage for C60 compared to the resulting adducts enables catalytic turnover.
金属有机 Pd(II)-亚酞菁笼已被证明可以催化 C 60和蒽在水中的 Diels-Alder 反应,生成具有高区域选择性的单加合物和双加合物。笼的催化量导致更好的转化,因为它有利于疏水空腔中基质的共封装。此外,与所得加合物相比,笼对C 60的更大结合亲和力能够实现催化转换。
Kinetics of the Diels–Alder reaction between C60 and acenes
作者:Ginka H. Sarova、Mário N. Berberan-Santos
DOI:10.1016/j.cplett.2004.09.005
日期:2004.10
The kinetics of the Diels-Alder reactions between C-60 and the linear acenes anthracene and tetracene are studied in toluene, in the temperature range 22-63 degreesC. It is observed that tetracene reacts much more readily with C-60 than does anthracene. The different reactivities of anthracene and tetracene towards C-60 correlate with the respective aromaticity loss upon cycloaddition, as previously predicted theoretically. The two monoadducts also display different kinetics as regards the dissociation back to the reagents. In the studied temperature range, tetracene monoadduct decomposition by retro-Diels Alder reaction is negligible, while the anthracene monoadduct is unstable above room temperature. (C) 2004 Elsevier B.V. All rights reserved.
Cycloadditions to [60]fullerene using microwave irradiation: A convenient and expeditious procedure
作者:Pilar de la Cruz、Antonio de la Hoz、Fernando Langa、Beatriz Illescas、Nazario Martin
DOI:10.1016/s0040-4020(96)01150-7
日期:1997.2
Several Diels-Alder and 1,3-dipolar cycloadditions to C-60 were performed, under microwave irradiation, in a modified domestic microwave oven and a focused microwave reactor. Reactions proceed within minutes to afford the respective cycloadducts in similar or increased yields related to the described methods by conventional heating. This methodology simplifies the procedure and overcomes the drawbacks resulting from the long reaction times required under classical heating conditions. (C) 1997, Elsevier Science Ltd.