2765-15-3Relevant academic research and scientific papers
Direct Synthesis of Symmetric Diarylethynes from Calcium Carbide and Arylboronic Acids/Esters
Fu, Rugang,Li, Zheng
, p. 6648 - 6651 (2017/12/15)
A new methodology for the direct synthesis of symmetric diarylethynes from the reactions of calcium carbide with arylboronic acids/esters is described. Various symmetric diarylethynes were generated from the corresponding arylboronic acids/esters in satisfactory yield by using a palladium catalyst. The advantages of this protocol include the use of a readily available and easy-to-handle acetylene source, and a simple work-up procedure.
Palladium-Catalyzed Domino Process: Synthesis of Symmetrical Diarylalkynes, cis- and trans-Alkenes using Lithium Acetylide as a Synthon
Krishna, Jonnada,Krishna Reddy, Alavala Gopi,Satyanarayana, Gedu
, p. 3597 - 3610 (2016/01/25)
An efficient domino protocol has been developed for the synthesis of symmetrical diarylalkynes. Notably, the method was successful in the presence of a palladium catalyst without the support of a copper co-catalyst. Significantly, the method enabled the use of the commercially available and cheap lithium acetylide ethylenediamine complex as a source of acetylene for the construction of dual C-C bonds, with a wide range of compatibility towards various substituents of the aryl bromides/iodides. Significantly, this protocol was successfully applied to the synthesis of cis- and trans-alkenes in a highly stereoselective manner in a sequential one-pot process.
Pd-catalyzed [2+2+1] coupling of alkynes and arenes: Phenol diazonium salts as mechanistic trapdoors
Schmidt, Bernd,Berger, Rene,Kelling, Alexandra,Schilde, Uwe
supporting information; experimental part, p. 7032 - 7040 (2011/07/30)
Alkynes and phenol diazonium salts undergo a Pd-catalyzed [2+2+1] cyclization reaction to spiro[4,5]decatetraene-7-ones. This structure was confirmed for one example by X-ray single-crystal structure analysis. The reaction is believed to proceed through oxidative addition of the phenol diazonium cation to Pd0, subsequent insertion of two alkynes, followed by irreversible spirocyclization. Copyright
Oxidation of dihydrazones of diaryl α-diketones to diarylacetylenes using sodium periodate
Takale, Balaram S.,Telvekar, Vikas N.
supporting information; experimental part, p. 1279 - 1280 (2011/02/17)
Oxidation of dihydrazones of α-diketones to acetylene was investigated by using sodium periodate. Further, the described method is also found to be suitable for deprotection of monohydrazones of aldehydes and ketones. The process is mild, efficient, and applicable to both electron-withdrawing and -donating substituents to give good to excellent yields.
Oxidation of Aromatic Compounds. IV. Oxidation of Symmetrical Diarylacetylenes in the CF3COOH-CH2Cl2-PbO2 System. A New One-Pot Synthesis of 1,2,3,4-Tetraaryl-2-butene-1,4-diones
Rudenko, A. P.,Vasil'ev, A. V.
, p. 1360 - 1379 (2007/10/03)
Oxidation of symmetrical diarylacetylenes in the CF3COOH-CH2Cl2-PbO2 system (0-20 deg C, 1-3 h) yields 1,2,3,4-tetraaryl-2-butene-1,4-diones.According to (1)H NMR and GC-MS data the compounds synthesized have Z configuration.
Magnetic interaction between the triplet centers in ethynylenebis(phenylnitrenes) and 1,3-butadiyne-1,4-diylbis(phenylnitrenes)
Murata, Shigeru,Iwamura, Hiizu
, p. 5547 - 5556 (2007/10/02)
The magnetic interaction of the two triplet phenylnitrene units linked together through an acetylene or a diacetylene linkage has been investigated by ESR spectroscopy. Two regioisomeric (meta,para′ and meta, meta′) diazides of 1,2-diphenylacetylene 12a a
