A newmethod is introduced to prepare hydrogen-substituted graphdiynes (HsGDYs) via the dehalogenative homocoupling of terminal alkynyl bromides. Compared with previous synthetic strategies, the reaction conditions are moderate and the time is shortened. HsGDYs exhibit porous structures and hydrogen/oxygen evolution reaction (HER/OER) catalytic activity, endowing applications in electrochemical catalysis
Regioselective Synthesis of 2,4,5-Trisubstituted Oxazoles and Ketene Aminals via Hydroamidation and Iodo-Imidation of Ynamides
作者:Rajendra K. Mallick、B. Prabagar、Akhila K. Sahoo
DOI:10.1021/acs.joc.7b02124
日期:2017.10.6
A novel and straightforward protocol is demonstrated for the synthesis of highly substituted oxazoles from readily accessible ynamides in the presence of ytterbium(III) trifluoromethanesulfonate [Yb(OTf)3], N-iodosuccinimide (NIS), and acetonitrile. Multiple oxazole skeletons in the aryl periphery are constructed in a single operation for the first time. The hydroamidation and iodo-imidation of ynamides
would serve as precursors to cage polyyne C60H6 and its perchloro derivative C60Cl6, respectively, were prepared. In the negative mode laser desorption mass spectra of the cyclophanes, the polyyne anions C60H6− and C60Cl6− were detected. Moreover, size-selectiveformation of C60+ as well as C60− was also observed, indicating the possible polyyne cyclization mechanism to form the fullerene cage.
Precursors to Endohedral Metal Fullerene Complexes: Synthesis and X-ray Structure of a Flexible Acetylenic Cyclophane C<sub>60</sub>H<sub>18</sub>
作者:Yves Rubin、Timothy C. Parker、Saeed I. Khan、Christopher L. Holliman、Stephen W. McElvany
DOI:10.1021/ja9606384
日期:1996.6.5
induced to rearrange to Csub 60} in the gas phase. MALDI-FTMS and APCI negative ion mass spectrometric studies on 7 have revealed a cluster of peaks around the molecular ion Csub 60}Hsub 18} at m/z 738. The most abundant ion corresponds to the parent ion 7, with the higher m/z peaks in the approximate relative abundance expected for natural sub 13}C incorporation in Csub 60}Hsub 18} and subsequent dehydrogenated
prepared as precursors of three-dimensionalpolyynes C78H18 (1a) and C78H12Cl6 (1b), respectively. Laser irradiation of 2a and 2b induced expulsion of the aromatic fragment, indane, to give the three-dimensionalpolyyne anions C78H18- and C78H12Cl6-, respectively. Whereas the former anion lost only four hydrogen atoms to form C78H14-, complete loss of all hydrogen and chlorine atoms was observed from the latter