Chemical and physical properties of 9-xanthylidene: a ground-state singlet aromatic carbene
作者:Stephen C. Lapin、Gary B. Schuster
DOI:10.1021/ja00300a028
日期:1985.7
Preparation du carbena-9xanthene par irradiation du diazo-9xanthene. Detection par spectroscopie d'absorption laser. Le carbene reagit rapidement avec les alcools pour former des ethers et avec les styrenes pour donner des cyclopropanes stereospecifiquement
制备 du carbena-9xanthene par 辐照 du diazo-9xanthene。检测标准光谱吸收激光。Le carbene reagit Rapidement avec les alcools Pour 前 des ethers et avec les 苯乙烯
Stereoselective synthesis of olefins by a reductive coupling reaction
作者:Guoxiong Hua、Yang Li、Alexandra M. Z. Slawin、J. Derek Woollins
DOI:10.1039/b702818k
日期:——
Ketones and aldehydes are converted to symmetrical and (E)-olefins (1-15) by reaction with 2,4-bis(phenyl)-1,3-diselenadiphosphetane-2,4-diselenide (PhPSe(2))(2), Woollins' reagent, in refluxing toluene; use of diketones was demonstrated by the reaction of PhC(O)CH(2)C(O)Ph which gives 1,2,4,5-tetraphenylbenzene (16) in 83% yield.
Bimolecular Formation of Radicals by Hydrogen Transfer, 12. – Transfer hydrogenation ofp-Substituted α-Methylstyrenes and of 9-Methylenefluorene as a Criterion of Mechanism
the solvent effect is small. A hydrogenatomtransfer mechanism (retrodisproportionation) is, therefore, preferred to a hydridetransfer mechanism. This is supported by the very similar reactivity of the hydrogentransfer reaction of DHA and XAN with 9-methylenefluorene. The product yields in all reactions investigated in this project were >90%.