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8495701 
Journal Article 
xxx As di-aryxxx equivalents in polycyclic axxx synthesis 
Hart, H; Lai, Cy; Chukuemeka Nwokogu, G; Shamouilian, S 
1987 
1 
Tetrahedron
ISSN: 0040-4020 
43 
22 
5203-5224 
English 
1,2,4,5-Tetrabromobenzenes and analogous napbthalanes react with one or two equivalents of n-butyllithum and various dienes (furans, pyrroles, cyclopentadienes, fulvenes) to form mono- or bis-cycloadducts. Highly substituted arenes can be obtained by removing the oxygen or nitrogens bridges from the furan or pyrrole adducts. By choice of conditions, two identical or two different rings can be fused to the di-aryne epuivalent. Improved short syntheses of permethylnaphthalene, -anthracene and -naphthacene are described. A new triphenylene synthesis is presented. © 1987.