作者:Sergey Pogodin、Israel Agranat
DOI:10.1021/ol9909435
日期:1999.11.1
[GRAPHICS]Reactions of phenalenone (2), benzanthrone (3), and naphthanthrone (4) with a low-valent titanium reagent (TiCl4/LiAIH(4)/THF) gave peropyrene (1), tetrabenzo[a,cd,j,lm]perylene (6), and dibenzo[ik,uv]dinaphtho[2,1,8,7-defg;2',1 ',8',7'-opqr]pentacene (10), respectively. The syntheses of the LPAHs 6 and 10 were regioselective, An unsymmetrical pathway of reductive peri-peri "dimerization" of the phenalenones leading to peropyrene-type LPAHs was proposed. Ab initio DFT B3LYP/6-311G** calculations indicated that D-2h-1, the most stable conformation, resembles the Clar picture of 1.