Allenes as Carbon Nucleophiles in Intramolecular Attack on (π-1,3-Diene)palladium Complexes: Evidence for trans Carbopalladation of the 1,3-Diene
作者:Ismet Dorange、Joakim Löfstedt、Katja Närhi、Johan Franzén、Jan-E. Bäckvall
DOI:10.1002/chem.200305056
日期:2003.7.21
eta(3)-(1,2,3)-cyclohexenyl- and eta(3)-(1,2,3)-cycloheptenylpalladium complexes, respectively, in which C-C bond formation between the allene and the 1,3-diene has occurred. Analysis of the (pi-allyl)palladium complexes by NMR spectroscopy, using reporter ligands, shows that the C-C bond formation has occurred by a trans carbopalladation involving nucleophilic attack by the middle carbon atom of the
丙二烯取代的环己-和环庚-1,3-二烯与[PdCl(2)(PhCN)(2)]的反应得到eta(3)-(1,2,3)-环己烯基-和eta(3)- (1,2,3)-环庚烯基钯络合物,其中在丙二烯和1,3-二烯之间已形成CC键。使用报道分子配体通过NMR光谱分析(pi-烯丙基)钯配合物,表明CC键的形成是通过反式碳钯反应进行的,该反应涉及丙二烯中间碳原子在(pi-diene)钯( II)复杂。(对-烯丙基)钯配合物的立体化学通过苯醌诱导的立体选择性转化为乙酸烯丙酯得到证实。