Results 21 to 30 of about 216,387 (290)

Relative Reactivity of the Metal-Amido versus Metal-Imido Bond in Linked Cp-Amido and Half-Sandwich Complexes of Vanadium [PDF]

, 2008
Treatment of (η5-C5H4C2H4NR)V(N-t-Bu)Me (R = Me, i-Pr) and CpV(N-p-Tol)(N-i-Pr2)Me (Cp = η5-C5H5) with B(C6F5)3 or [Ph3C][B(C6F5)4] results in formation of the corresponding cations, [(η5-C5H4C2H4NR)V(N-t-Bu)]+ and [CpV(N-p-Tol)(N-i-Pr2)]+.
Alonso F., Anderson L. L., Anderson L. L., Bouwkamp M. W., Bytschkov I., Carpentier J.-F., Doye S., Frisch M. J., Gagné M. R., Gagné M. R., Horton A. D., Hughes A. K., Johnson J. S., Li Y., Lorber C., Margl P., Mayer J. M., Müller T. E., Nobis M., Odom A. L., Pohlki F., Pohlki F., Preuss F., Preuss F., Sinnema P. J., Straub B. F., Stubbert B. D., Vanka K., Vatamanu M., Witte P. T., Wu F., Yamada J.   +31 more
core   +5 more sources

An overview of the cycloaddition chemistry of fulvenes and emerging applications

Beilstein Journal of Organic Chemistry, 2019
The unusual electronic properties and unique reactivity of fulvenes have interested researchers for over a century. The propensity to form dipolar structures at relatively low temperatures and to participate as various components in cycloaddition ...
Ellen Swan, Kirsten Platts, Anton Blencowe   +2 more
doaj   +1 more source

Computational and Spectral Investigation of 5,12-Dihydro-5,12-ethanonaphthacene-13-carbaldehyde

Molecules, 2011
A conformational search of 5,12-dihydro-5,12-ethanonaphthacene-13-carbaldehyde predicted the presence of twelve conformations. The geometry of the twelve conformations established at the B3LYP/6-31G* level showed only six unique ones.
Abdulrahman I. Almansour, Adel A. El-Azhary, Usama Karama, Mohammed H. Jaafar, Turki M. Al-Turki, Abdulla A. Al-Kahtani   +5 more
doaj   +1 more source

Cycloaddition an Benzvalen [PDF]

Angewandte Chemie, 1973
AbstractBenzvalen (I) reagiert in ätherischer Lösung mit den Benzonitriloxiden (II) zu den Addukten (IIIa).
openaire   +4 more sources

Cycloadditions to 1,1‐Dicyclopropylethylene [PDF]

Angewandte Chemie International Edition in English, 1969
While the stabilization of cationic centers by alpha cyclopropyl groups has been verified in many instances [2,31, to the best of our knowledge nothing is known about the influenceof cyclopropyl groups, as substituents, on the reaction mechanism of multiple bonds. The α-cyclopropylcarbonium ions 141 that may be formed are capable of rearrangement, thus
Effenberger, Franz, Podszun, Wolfgang
openaire   +4 more sources

Alkyne–Alkene [2 + 2] cycloaddition based on visible light photocatalysis

Nature Communications, 2020
UV-activated alkyne–alkene [2 + 2] cycloaddition has served as an important tool to access cyclobutenes. Although broadly adopted, the limitations with UV light as an energy source prompted us to explore an alternative method.
Sujin Ha, Yeji Lee, Yoonna Kwak, Akash Mishra, E. Yu, Bokyeong Ryou, Cheol‐Min Park   +6 more
semanticscholar   +1 more source

Synthesis of Anthraquinones by Iridium-Catalyzed [2 + 2 + 2] Cycloaddition of a 1,2-Bis(propiolyl)benzene Derivative with Alkynes

Inorganics, 2019
[2 + 2 + 2] cycloaddition of a 1,2-bis(propiolyl)benzene derivative with terminal and internal alkynes takes place in the presence of [Ir(cod)Cl]2 (cod = 1,5-cyclooctadiene) combined with bis(diphenylphosphino)ethane (DPPE) to give anthraquinones in 42 ...
Takahiro Sawano, Yuko Toyoshima, Ryo Takeuchi   +2 more
doaj   +1 more source

Polar Diels-Alder Reactions using Heterocycles as Electrophiles. Influence of Microwave Irradiation [PDF]

, 2015
In this work we studied a series of polar Diels-Alder reactions using different heterocycles derivatives acting as electrophiles joint to dienes of different nucleophilicity, analyzing the effect of the microwave irradiation in these processes. We employ
Della Rosa, Claudia Daniela, Kneeteman, Maria Nelida, López Baena, Anna Francesca, Mancini, Pedro Maximo Emilio   +3 more
core   +1 more source

The crystal structures of 6′-(4-chlorophenyl)- and 6′-(4-methoxyphenyl)-6a′-nitro-6a′,6b′,7′,9′,10′,12a′-hexahydro-2H,6′H,8′H-spiro[acenaphthylene-1,12′-chromeno[3,4-a]indolizin]-2-one

Acta Crystallographica Section E: Crystallographic Communications, 2019
In the title compounds, C32H25ClN2O4 (I) and C33H28N2O5 (II), the six-membered pyran and piperidine rings adopt envelope and chair conformations, respectively. The five-membered pyrrolidine rings adopt twist conformations. Compound (II) crystallizes with
S. Syed Abuthahir, M. NizamMohideen, V. Viswanathan, D. Velmurugan, J. Nagasivarao   +4 more
doaj   +1 more source

Donor-Acceptor Substituted Benzo-, Naphtho- and Phenanthro-Fused Norbornadienes

Molecules, 2020
The photochromic norbornadiene/quadricyclane (NBD/QC) couple has found interest as a molecular solar thermal energy (MOST) system for storage of solar energy.
Mads Mansø, Lorette Fernandez, Zhihang Wang, Kasper Moth-Poulsen, Mogens Brøndsted Nielsen   +4 more
doaj   +1 more source