Cross-Coupling of Alkenyl/Aryl Carboxylates with Grignard Reagent via Fe-Catalyzed C−O Bond Activation
作者:Bi-Jie Li、Li Xu、Zhen-Hua Wu、Bing-Tao Guan、Chang-Liang Sun、Bi-Qin Wang、Zhang-Jie Shi
DOI:10.1021/ja907281f
日期:2009.10.21
Iron-catalyzed cross-coupling of alkenyl/aryl carboxylates with primary alkyl Grignard reagent was described. This reaction brought a new family of electrophiles to iron catalysis. The combination of an inexpensive carboxylate electrophile and an iron catalyst would generate ample advantages.
Valenzisomerisierung voncis-Dienonen, III Lichtinduzierte Umlagerung von 5-Phenyl-penta-2,4-dienaldehyden [1]
作者:P. Schiess、ChR. Suter
DOI:10.1002/hlca.19710540827
日期:1971.12.10
Irradiation of 5-phenyl-2,4-pentadienaldehydes 1 and 2 leads to a rapid cis, trans-isomerization of the 4,5-double bond followed by formation of unsaturated ketenes 7 and 12, respectively, through a [1.5]-hydrogen shift. In the dark, ketenes 7 and 12 revert at room temperature to the 5-phenyl-2,4-pentadienaldehydes 1 und 2. Activation parameters and solvent dependence have been determined for this