Reactions of free radicals with η<sup>3</sup>-allylpalladium(<scp>ii</scp>) complexes: phenyl and trityl radicals
作者:Simon J. Reid、Michael C. Baird
DOI:10.1039/b307308d
日期:——
The compounds (η3-allyl)PdCl(PPh3) and [(η3-allyl)Pd(PPh3)2]Cl react with phenyl and trityl radicals generated from the thermaldecomposition of phenylazotriphenylmethane (PhNNCPh3, PAT) in benzene at 60 °C. The products are the palladium phenyl compounds, [PdPhCl(PPh3)]2 and trans-PdPhCl(PPh3)2, respectively, and 4,4,4-triphenyl-1-butene, the latter being the result of coupling of the trityl radical
We have developed a highly regio-, diastereo-, and enantioselective Cu-catalyzed desymmetrization of inert meso-diethers using Grignard reagents. Moreover, previous inaccessible sterically hindered organometallic reagents are realized in the reaction with broad secondary alkyl Grignard reagents. Finally, detailed control experiments and density functional theory calculations revealed the desymmetrization
我们使用格氏试剂开发了一种高度区域选择性、非对映选择性和对映选择性的铜催化惰性内消旋二醚去对称化反应。此外,以前难以获得的位阻有机金属试剂是在与宽仲烷基格氏试剂的反应中实现的。最后,详细的控制实验和密度泛函理论计算表明,在不存在原位生成的烯丙基溴中间体的情况下,内消旋二醚的去对称化利用了直接的抗-S N 2'途径。接下来的氧化加成是关键的速率决定和对映选择性决定步骤。
Stereo and regioselectivity in the phenylation of cationic allylpalladium(II) α-diimine complexes by tetraphenylborate anion
作者:Bruno Crociani、Simonetta Antonaroli、Francesca Di Bianca、Alberta Fontana
DOI:10.1016/0022-328x(93)80131-t
日期:1993.5
The reaction of the cationic complex [Pd(4-methoxy-1,3-η3-cyclohexenyl)(py-2-CHNC6H4OMe-4)]+ (1) with BPh4− in the presence of fumaronitrile yields trans-3-methoxy-6-phenylcyclohexene (2a) and trans-4-methoxy-3-phenylcyclohexene (2b), in ca. 1 : 1 molar ratio. The trans stereochemistry of these products implies that the phenylation of the allyl ligand involves prior transfer of a phenyl group from