Stable Alkanes Containing Very Long Carbon–Carbon Bonds
作者:Andrey A. Fokin、Lesya V. Chernish、Pavel A. Gunchenko、Evgeniya Yu. Tikhonchuk、Heike Hausmann、Michael Serafin、Jeremy E. P. Dahl、Robert M. K. Carlson、Peter R. Schreiner
DOI:10.1021/ja302258q
日期:2012.8.22
diamondoid bromides gave highly sterically congested hydrocarbon (hetero)dimers with exceptionally long central C-C bonds of up to 1.71 Å in 2-(1-diamantyl)[121]tetramantane. Yet, these dimers are thermally very stable even at temperatures above 200 °C, which is not in line with common C-C bond length versus bond strengths correlations. We suggest that the extraordinary stabilization arises from numerous
叔金刚石溴化物的金属诱导偶联产生高度空间拥挤的烃(杂)二聚体,在 2-(1-二金刚烷基)[121]四金刚烷中具有高达 1.71 Å 的超长中心 CC 键。然而,这些二聚体即使在高于 200 °C 的温度下也非常稳定,这与常见的 CC 键长与键强度的相关性不一致。我们认为这种非凡的稳定性源于相邻的 H 端接金刚石状表面之间的众多分子内范德华引力。1-(1-金刚烷基)二金刚烷、1-(1-金刚烷基)二金刚烷、2-(1-金刚烷基)三金刚烷、2-(1-二金刚烷基)三金刚烷和2-(1-二金刚烷基)的CC键旋转动力学[121]四金刚烷通过变温(1)H-和(13)C NMR光谱进行了研究。向内 (endo) CH 表面的形状决定了动态行为,将中央 CC 键旋转障碍从 7 更改为 33 kcal mol(-1)。我们用 6-31G(d,p) 探讨了流行的密度泛函理论 (DFT) 方法(包括 BLYP、B3L
Synthesis of triamantane
作者:Fredric S. Hollowood、M. Anthony McKervey、Robert Hamilton、John J. Rooney
DOI:10.1021/jo01312a026
日期:1980.11
HOLLOWOOD F. S.; MCKERVEY M. A.; HAMILTON R.; ROONEY J. J., J. ORG. CHEM., 1980, 45, NO 24, 4954-4958
作者:HOLLOWOOD F. S.、 MCKERVEY M. A.、 HAMILTON R.、 ROONEY J. J.
DOI:——
日期:——
Diamondoid-modified DNA
作者:Yan Wang、Boryslav A. Tkachenko、Peter R. Schreiner、Andreas Marx
DOI:10.1039/c1ob05929g
日期:——
We prepared novel C5-modified triphosphates and phosphoramidites with a diamondoid functionally linked to the nucleobase. Using primer extension experiments with different length templates we investigated whether the modified triphosphates were enzymatically incorporated into DNA and whether they were further extended. We found that all three modified nucleotides can be incorporated into DNA using a single-nucleotide incorporation experiment, but only partially using two templates that demand for multiple incorporation of the modified nucleotides. The modified phosphoramidites were introduced into oligonucleotides utilizing DNA synthesizer technology. The occurring oligonucleotide structures were examined by circular dichroism (CD) and melting temperature (Tm) measurements and were found to adapt similar helix conformations as their unmodified counterparts.
Functionalized Nanodiamonds: Triamantane and [121]Tetramantane
作者:Peter R. Schreiner、Natalie A. Fokina、Boryslav A. Tkachenko、Heike Hausmann、Michael Serafin、Jeremy E. P. Dahl、Shenggao Liu、Robert M. K. Carlson、Andrey A. Fokin
DOI:10.1021/jo052646l
日期:2006.9.1
The selective functionalizations of the fundamental hydrogen-terminated nanodiamonds triamantane 1, as well as the most symmetrical representative of the tetramantanes (C2h-[121]tetramantane 2) were elaborated. Electrophilic reagents (Br2, HNO3) predominantly attack the medial C−H positions of the cages; bromination of 2 gave the medial 2-bromo derivative almost exclusively. Highly selective apical