Tandem enyne allene-radical cyclization via base-catalyzed isomerization of enediyne sulfones
作者:Janet Wisniewski Grissom、Detlef Klingberg
DOI:10.1016/00404-0399(50)1366-p
日期:1995.9
Enediyne sulfones 12–16 undergo a base-catalyzedisomerization to the corresponding enyne allenes followed by a tandem enyne allene-radical cyclization at 37 °C to provide 2,3-dihydrobenz[e]indenes 17–21 in good yields.
烯炔砜12-16经过碱催化异构化为相应的烯炔丙二烯,然后在37°C下串联烯炔丙烯-自由基环化,以高收率提供2,3-二氢苯并[ e ]茚17-21。
Experimental and Computational Evidence for Gold Vinylidenes: Generation from Terminal Alkynes via a Bifurcation Pathway and Facile C–H Insertions
作者:Longwu Ye、Yanzhao Wang、Donald H. Aue、Liming Zhang
DOI:10.1021/ja2091992
日期:2012.1.11
species is highly reactive and undergoes facile intramolecular C(sp(3))-H insertions as well as O-H and N-H insertions. The formation step for the gold vinylidene is predicted theoretically to be complex with a bifurcated reaction pathway. A pyridine N-oxide acts as a weak base to facilitate the formation of an alkynylgold intermediate, and the bulky BrettPhos ligand in the gold catalyst likely plays a
The synthesis of a carbon analogue of scytonemin was accomplished on the basis of molybdenum-mediated intramolecular double Pauson–Khand type reaction of bis(allenyne), followed by the double aldol condensation of the formed double Pauson–Khand type adduct.
Synthesis of Novel “Rod−Coil” Brush Polymers with Conjugated Backbones through Bergman Cyclization
作者:Xin Cheng、Jianguo Ma、Jian Zhi、Xi Yang、Aiguo Hu
DOI:10.1021/ma902176j
日期:2010.1.26
This work reports synthesis of “rod−coil” brush polymers with rigid conjugated backbone. “Grafting through” strategy was employed via combination of ring-opening polymerization (ROP) and Bergmancyclizationpolymerization. Enediyne-containing macromonomers were first synthesized through ROP of caprolactone with dual-functional initiators conceiving free hydroxy groups and dialkynylbenzene moieties
Formation of polymeric nanoparticles via Bergman cyclization mediated intramolecular chain collapse
作者:Benchuan Zhu、Jianguo Ma、Zhiwen Li、Jing Hou、Xin Cheng、Guannan Qian、Pai Liu、Aiguo Hu
DOI:10.1039/c0jm03143g
日期:——
Polymeric nanoparticles were synthesized through Bergman cyclization mediated intramolecular chain collapse. Enediyne moieties were incorporated into linear polymers through copolymerization or post-polymerization modification. The resulted enediyne containing copolymers were then subjected to intramolecular chain collapse under ultra-dilute condition or applying a continuous addition technique. The occurrence of Bergman cyclization was confirmed with IR, NMR and DSC analysis. The intramolecular chain collapse was characterized with GPC, DSC, and AFM. Dramatic decreases of apparent molecular weights of linear copolymers were observed after Bergman cyclization. The structural diversity of enediyne precursors and mild chain collapse condition allow wide monomer selection, which facilitates preparation of a broad range of polymeric nanoparticles. Low-k dielectric thin films were prepared using polymeric nanoparticles through “porogen” approach. The packing tightness of polymeric nanoparticles showed strong influence on film formation behavior with MSSQ matrix. With tightly packed polymeric nanoparticles as sacrificial pore generators, thin films with dielectric constants of as low as 2.1 were obtained.