29949-92-6Relevant articles and documents
Radical Cations of Bridged Bicycloocta-2,5-dienes - Open-Shell Bis-Homoaromatic Systems
Roth, Heinz D.,Abelt, Christopher J.
, p. 2013 - 2019 (1986)
The radical cations of a series of bridged bicycloocta-2,5-dienes have been generated by photoinduced electron transfer to strong electron acceptors (chloranil, fluoranil) in solution.Chemically induced dynamic nuclear polarization effects observed
A convenient route to α,β-unsaturated aldehydes based on polymer-supported α-selenoaldehydes
Sheng, Shou-Ri,Wu, Lu-Ling,Huang, Xian
, p. 258 - 259 (2007/10/03)
Polystyrene-supported (4-phenylseleno)morpholine was synthesised and could be used as an efficient α-selenenylating agent for saturated aldehydes; subsequent oxidation of polystyrene-supported α-selenoaldehydes and the products from the Wittig reaction of them with chloromethylidenetriphenylphosphorane with an excess of 30% hydrogen peroxide at room temperature afforded α,β-unsaturated aldehydes in good yields and purities.
Regiochemistry in aryl radical cyclization onto methylenecycloalkanes
Ishibashi,Kobayashi,Nakashima,Tamura
, p. 9022 - 9027 (2007/10/03)
Bu3SnH-mediated aryl radical cyclization onto methylenecycloalkanes having a phenylthio, an ester, or a nitrile group at the terminus of the alkenic bond provides exclusively exo cyclization products. The results are in sharp contrast to those reported for nonsubstituted methylenecycloalkanes, which give exclusively endo cyclization products. Formation of endo cyclization products has been suggested to be a result of a consecutive 5-exo cyclization of an aryl radical and neophyl rearrangement. The exo-selective aryl radical cyclization offers a new method for synthesizing fused aromatic compounds containing a benzylic quaternary carbon atom.
Cyclohexenone construction by intramolecular alkylidene C-H insertion: Synthesis of (+)-cassiol
Taber, Douglass F.,Meagley, Robert P.,Doren, Douglas J.
, p. 5723 - 5728 (2007/10/03)
We report new procedures for stereoselective cyclopentene and cyclohexenone construction employing the alkylidene carbene C-H insertion reaction. Described are diastereoselective insertion into methylene and enantiospecific insertion into methine C-H bonds. The latter case leads directly to the enantioselective synthesis of (+)-cassiol (1).
Convenient Methods for the Preparation of p-Dialkylaminophenylacetylenes
Akiyama, Shuzo,Nakatsuji, Shin'ichi,Yoshida, Keiko,Nakashima, Kenichiro,Hagiwara, Toshimitsu,et al.
, p. 361 - 362 (2007/10/02)
Two convenient methods for the preparation of p-dialkylaminophenylacetylenes are reported: a) Dehydrobromination of the brominated compounds obtained easily from the dialkylamino substituted cinnamic acids in acetic acid instead of chloroform; b) dehydrochlorination of the 2-chlorostyrene derivative obtained from the reaction of p-dimethylaminobenzaldehyde with chloromethylenetriphenylphosphorane.
SYNTHESIS OF 3-VINYLCYCLOPROPENE DERIVATIVES
Zefirov, N. S.,Averina, N. V.,Boganov, A. M.,Laryukova, M. V.,Rashchupkina, Z. A.,et al.
, p. 1291 - 1300 (2007/10/02)
Derivatives of 3-vinylcyclopropene were synthesized from 1,2-dimethyl-3-acetyl-, 1,2-dimethyl-3-formyl-, and 1-methyl-2-trimethylsilyl-3-formylcyclopropenes and the corresponding triphenylalkylidenephosphoranes.
3-(Substituted) vinyl cephalosporins
-
, (2008/06/13)
New 3-(substituted) vinyl cephalosporin compounds, e.g., 3-(2'-ethoxycarbonylvinyl)-7-phenoxyacetamido-3-cephem-4-carboxylic acid, which are useful as antibiotics, and 3-(substituted) vinyl cephalosporin compounds which are useful as intermediates in preparing antibiotic substances.
