6177-94-2Relevant academic research and scientific papers
Protonation of Tetraphenyl- and 2,3,4-Triphenylcyclopentadienone – An NMR and X-ray Crystallographic Study
Harrington, Laura E.,Britten, James F.,Casey, Michael,Grealis, John,Ortin, Yannick,Müller-Bunz, Helge,McGlinchey, Michael J.
, p. 3249 - 3255 (2017/06/21)
The protonation of 2,3,4,5-tetraphenylcyclopentadienone (tetracyclone) yields 6,11-diphenyl-5H-benzo[a]fluoren-5-one (17) and 2,3,4,5-tetraphenylcyclopent-2-en-1-one (18) as the major products. This contrasts with the pyrolysis of tetracyclone, which yields 5,6-diphenyl-11H-benzo[a]fluoren-11-one (22), a structural isomer of 17. Mechanisms are presented that rationalize these observations. The protonation of 4-hydroxy-2,3,4-triphenylcyclopent-2-en-1-none, the precursor to 2,3,4-triphenylcyclopentadienone, generates 2-(2′-oxo-3′,4′,5′-triphenylcyclopent-3′-enyl)-3,4,5-triphenylcyclopenta-2,4-dienone (30), which has been unequivocally characterized by X-ray crystallography. The establishment of the conformation of molecule 30 in the solid state, which correlates with the conformation in solution, provides a rationale for the subsequent formation of the tetrahydro-pentaphenyl-as-indacene-3,4-dione (32) upon further protonation.
Rhodium (I)-catalyzed reductive cyclocarbonylation of internal alkynes: Atom-economic process for synthesis of 2-cyclopenten-1-ones, 5-alkylidenefuran-2(5H)-ones and indan-1-ones
Huang, Qiufeng,Hua, Ruimao
supporting information; experimental part, p. 3817 - 3822 (2009/12/07)
The reductive cyclocarbonylation of internal alkynes with carbon monoxide catalyzed by [{RhCl(CO)2}2]/CO(NH2)2 in the presence of water has been investigated. Dialkyl alkynes underwent a reductive [2+2+1] cycloc
CYCLOPENTADIENONES IN THE REACTION OF ALKYNES WITH CYCLOPROPYLCARBENE-CHROMIUM COMPLEXES
Herndon, James W.,Tumer, Seniz U.
, p. 295 - 296 (2007/10/02)
Reaction of alkynes having bulky substituents with pentacarbonylchromium(0) (1) provided cyclopentadienone derivatives.Cyclopentadienones were easily hydrogenated to the corresponding cyclopentenones using chromium hexacarbo
REDUCTIVE SUBSTITUTION OF NICKELOCENE; INTERCEPTION OF A MONOHYDRIDO INTERMEDIATE IN THE HYDROGENATION OF 2,3,4,5-TETRAPHENYLCYCLOPENTADIENONE (TETRACYCLONE)
Slocum, D. W.,Moronski, Marek,Gooding, Richard,Duraj, Stan
, p. C26 - C28 (2007/10/02)
Reductive substitution of nickelocene with tetracyclone affords bis(tetracyclone)nickel(0) (1), η3-1,2,3,4-tetraphenyl-5-ketocyclopentenylcyclopentadienylnickel (2) and trans-1,2,3,4-tetraphenylcyclopenten-1-one-5 (3); evidence is presented that 2 is an intermediate in the formation of 3 from 1.
Reactions of Azepine, Diazepine, Tropone, and Cyclopentadienone Derivatives with Some Chlorosilane Derivatives in the Presence of Magnesium
Saito, Katsuhiro,Kojima, Hisashi,Okudaira, Tsuguo,Takahashi, Kensuke
, p. 175 - 179 (2007/10/02)
The reaction of 1-ethoxycarbonyl-1H-azepine with chlorosilane derivatives in HMPA in the presence of magnesium afforded the silanol derivatives, which upon heating gave the corresponding siloxane derivatives.In the same manner, tropone and 2,5-dimethyl-3,
