Sulfur ylides generated from the reaction of adamantylidene and phenylcarbene with sulfur substrates
作者:Yuri N Romashin、Michael T.H Liu、Brian T Hill、Matthew S Platz
DOI:10.1016/s0040-4039(03)01589-2
日期:2003.8
allylethylsulfide, allylphenylsulfide, and trimethylenesulfide involves the formation of a sulfur ylide intermediate, followed by H-migration, 2,3-sigmatropic shift, or ring opening to give sulfides. The sulfur ylide formed in the reaction of phenylcarbene with trimethylenesulfide is directly observed by laser flashphotolytic techniques.
intermolecular reactions and we found a rare singlet carbene pathway in CH3OH involving protonation and formation of a carbocation, detected due to the specific rearrangement of the pentacycloundecane skeleton. Singlet diazirines undergo intersystem crossing and deliver triplet carbenes that react with oxygen to form ketones which were isolated after irradiation. Our main finding is that the formation of diazirine
通过在不同溶剂中的制备性辐照,激光闪光光解(LFP)和量子化学计算,研究了五环十一烷(PCU)和金刚烷重氮的光化学反应性。此外,通过1 H NMR光谱,等温微量热法和圆二色性光谱研究了瓜子[7]尿素,β-和γ-环糊精(β-和γ-CD)与二嗪类的包合物的形成,然后研究了形成的配合物的光化学反应性。Diazirines经受氮的高效光化学消除(Φ - [R > 0.5),并提供相应的单卡宾。单线态碳烯在分子内和分子间反应中反应,我们在CH 3中发现了罕见的单线态卡宾通路由于五环十一烷骨架的特定重排,检测到涉及质子化和碳正离子形成的OH。单重二叠氮灵经过系统间交换并传递三重碳烯,这些碳三烯与氧反应形成酮,并在辐照后将其分离出来。我们的主要发现是,带有β-CD和γ-CD的二嗪类夹杂物的形成改变了单重态与三重态途径的相对比,单重碳烯产物在受辐照配合物的化学作用中占主导地位。我们的理论和实验研究相结合,
Stable group 8 metal porphyrin mono- and bis(dialkylcarbene) complexes: synthesis, characterization, and catalytic activity
作者:Hai-Xu Wang、Qingyun Wan、Kam-Hung Low、Cong-Ying Zhou、Jie-Sheng Huang、Jun-Long Zhang、Chi-Ming Che
DOI:10.1039/c9sc05432d
日期:——
(CHR or CR2, R = alkyl) complexes have been extensively studied for alkylcarbene (CHR) ligands coordinated with high-valent early transition metal ions (a.k.a. Schrock carbenes or alkylidenes), yet dialkylcarbene (CR2) complexes remain less developed with bis(dialkylcarbene) species being little (if at all) explored. Herein, several group 8 metal porphyrin dialkylcarbene complexes, including Fe- and R
Structure−Reactivity Relationships: Reactions of a 5-Substituted Aziadamantane in a Resorcin[4]arene-based Cavitand
作者:Gerald Wagner、Wolfgang Knoll、Michael M. Bobek、Lothar Brecker、Hendrikus W. G. van Herwijnen、Udo H. Brinker
DOI:10.1021/ol902667a
日期:2010.1.15
two novel C5-substituted adamantanediazirines within the resorcin[4]arene-based cavitand 4 were investigated in DMSO-d6, revealing that binding is up to 1.4 kcal/mol stronger for halogenated adamantanediazirines when compared with the unsubstituted species. The thermal behavior of 5-bromo-2-aziadamantane (3) was investigated by DSC analysis as the first representative of the adamantanediazirine family
在DMSO- d 6中研究了间苯二酚[4]芳烃基cavitand 4中两个新颖的C5取代的金刚烷二嗪在络合物中的络合特性,发现与未取代的金刚烷二嗪相比,卤代金刚烷二嗪的结合力高达1.4 kcal / mol。通过DSC分析研究了5-bromo-2-aziadamantantane(3)的热行为,它是纯金刚烷二金刚烷家族的首个代表,并被封装在cavitand 4的芳香腔中。在固相中,光分解或热分解生成的5-溴-2-金刚烷叉(11)的反应可以通过cavitand 4内的络合来控制。。
Isolation and Characterization of a Carbene Derivative of La@C<sub>82</sub>
作者:Yutaka Maeda、Yoichiro Matsunaga、Takatsugu Wakahara、Satomi Takahashi、Takahiro Tsuchiya、Midori O. Ishitsuka、Tadashi Hasegawa、Takeshi Akasaka、Michael T. H. Liu、Kisato Kokura、Ernst Horn、Kenji Yoza、Tatsuhisa Kato、Shingo Okubo、Kaoru Kobayashi、Shigeru Nagase、Kazunori Yamamoto
DOI:10.1021/ja0316115
日期:2004.6.1
The photochemical reaction of La@C82 with 2-adamantane-2,3-[3H]-diazirine affords adduct 2, La@C82(Ad), in a quantitative and highly selective manner. The structure of compound 2 is confirmed by ESR, MS, and UV-vis-NIR spectroscopies, and the first X-ray crystallographic characterization of an endohedral monometallofullerene derivative is reported.