作者:David Sémeril、Dominique Matt、Loïc Toupet
DOI:10.1002/chem.200800747
日期:2008.8.18
straightforwardly provide chelate complexes in which the metal centre sits in a molecular pocket defined by two naphthyl planes related by the C(2) axis and the two apically situated R groups. Hydroformylation of octene with the L(Pr)/Rh system turned out to be highly regioselective, the linear-to-branched (l:b) aldehyde ratio reaching 58:1. The l:b ratio significantly increased when the propyl groups were replaced
半球形二亚磷酸酯(R,R)-或(S,S)-5,11,17,23-四叔丁基-25,27-di(OR)-26,28-双(1,1'-双萘基2,2'-二氧杂磷酰氧基)杯[4]芳烃(R = OPr,OCH(2)Ph,OCH(2)-萘基,O-芴基; R = H,R'= OPr)(L(R )),全部具有C(2)对称性,已从适当的二-O-烷基化杯[4]芳烃前体开始合成。在[Rh(acac)(CO)(2)]的存在下,这些配体直接提供螯合物,其中金属中心位于由两个与C(2)轴相关的萘平面和两个顶点所定义的分子袋中位于R组。L(Pr)/ Rh系统对辛烯的加氢甲酰化反应显示出高度的区域选择性,线性与支化(l:b)醛的比例达到58:1。当丙基被-CH(2)Ph(1:b = 80)或-CH(2)萘基(l:b = 100),即具有能够与顶端金属位点空间相互作用但不引起裂口开口的嵌套取代基,该裂口嵌套了催化中心。在苯乙烯