hydrocarbons (PAHs), decorated with phase-forming and solubilizing n-dodecyl chains, are presented based on the intramolecular cyclodehydrogenation reaction of suitable oligophenylene precursors. The formal addition of successive C2 units into the armchair bays of the parent hexa-peri-hexabenzocoronene extends the aromatic system and leads to PAHs with a partial zigzag periphery. This variation of the
The directed <i>ortho</i> metalation - palladium catalyzed cross coupling connection. A general regiospecific route to 9-phenanthrols and phenanthrenes. Exploratory further metalation
作者:Jian-min Fu、Victor Snieckus
DOI:10.1139/v00-055
日期:2000.6.1
A new general and regiospecific synthesis of 9-phenanthrols (1 +2 3 4, Scheme 1, Table 1) proceeding by a Directed ortho Metalation (DoM), Suzuki-Miyaura cross coupling, and a new LDA-mediated Directed remote Metalation sequence is described. The facile Pd-catalyzed hydrogenolysis of the phenanthrols 4 into the corresponding phenanthrenes 5 via their triflates 18 translates the original DoM regioselectivity