Thermolysis of bis[2-[(trimethylsilyl)oxy]propyl]furoxan (TOP-furoxan). The first practical method for intermolecular cycloaddition of an in situ generated nitrile oxide with 1,2-di- and trisubstituted olefins
作者:Dennis P. Curran、Christopher J. Fenk
DOI:10.1021/ja00307a031
日期:1985.10
mono-, di- et trisubstituees conduit aux isoxazolines-2. Un mecanisme est propose faisant intervenir une cycloreversion du furoxanne en trimethylsiloxy-2 methyl-2 propiononitrile oxyde suivi d'une cycloaddition dipolaire [3+2] irreversible avec l'olefine
La 热解 du furoxanne du titre en存在 d'烯烃单-,二-和三取代导管辅助异恶唑啉-2。Un mecanisme est 提出 faisant intervenir une cycloreversion du furoxanne en trimethylsiloxy-2methyl-2 propiononitrile oxyde suivi d'une cycladdition dipolaire [3+2] 不可逆 avec l'烯烃
Regio- and Enantioselective Linear Cross-Dimerizations between Conjugated Dienes and Acrylates Catalyzed by New Ru(0) Complexes
New naphthalene complexes of Ru(0) with various Ru(η6-naphthalene)(cyclic diene) (3) ligands catalyze linear cross-dimerization between conjugated dienes and acrylates. One of the noteworthy catalysts is the dibenzocyclooctatetraene complex 3d, which shows high catalytic activity for the cross-dimerization between 1,3-pentadiene and methyl acrylate to give the cross-dimers in 99% yield (branch/linear
Cyclobutene Photochemistry. Steric Effects on the Photochemical Ring Opening of Alkylcyclobutenes
作者:William J. Leigh、J. Alberto Postigo
DOI:10.1021/ja00111a004
日期:1995.2
total quantum yield for ringopening increases to a maximum of -0.3 and then decreases with further methyl substitution. The quantum yields for ringopening (t q5tod for the cis-isomer is significantly lower, but both yield an approximate 1:l mixture of formally allowed and forbidden diene isomers. A similar trend is observed in the relative quantum yields for ringopening and cycloreversion throughout
Synthesis of and Catalytic Linear Cross-Dimerizations by an Electron-Deficient Cyclic Diene Complex of Ruthenium(0)
作者:Masafumi Hirano、Yukino Tanaka、Nobuyuki Komine
DOI:10.1021/acs.organomet.8b00645
日期:2018.11.26
ruthenium(0) complex [Ru(η6-naphthalene)(η4-Ph-dbcot)] (1a: Ph-dbcot = 5-phenyldibenzo[a,e]cyclooctatetraene) is newly prepared in 53% yield. The IR experiment of [Ru(η4-2,3-dimethylbutadiene)(η4-Ph-dbcot)(CO)] (2a) shows this formal zerovalent ruthenium complex to be very electron-deficient, even though the Ph-dbcot ligand does not have any particular electron-withdrawing functional group. Complex 1a shows
Titanacyclobutenes, readily prepared from Cp2TiCH2·Al(CH3)2Cl and alkynes, react with ketones and aldehydes to afford metallacyclic products resulting from insertion into either the titanium-alkyl or the titanium-vinyl bond of the titanacyclobutene. The latter insertion products are thermally unstable, undergoing facile retro [4+2] cycloaddition to afford substituted 1,3-dienes in good yield.