Anthra thiophene

Thiophen Analogues of Polycyclic Aromatic Hydrocarbons Analogues of Anthracene and Phenanthrene. - Keto-enol tautomerism in a naphtho- and several anthra-thiophen systems [such as (241) (242)] has been studied. The system (241) (242) was obtained via the Friedel-Crafts reaction of thiophen with naphthalene-2,3-dicarboxylic anhydride followed by ring-closure. A [c] -fused system was similarly obtained by starting from... 

Anthranilide derivatives in which an aryl group was directly connected to the anthranilide unit were also reported [63]. Similarly, anthra-nilides connected to a five-membered heterocycle such as thiazole, thiophene, or pyrazole were also covered by the patent literature [64]. Representative examples of these two classes are analogs 16 and 17. 

Naphtho[2,3-b jthiophene derivatives (316) have been synthesized by this scheme, starting with phthalic anhydride, which could be reacted with thiophene under Friedel-Crafts conditions to give (315) (52JA4353). By the same scheme, anthra[2,3-bjthiophene (318) was obtained from (317) in 51% yield, by reduction of the acid to aldehyde and cyclization in PPA (81JHC967). 

The fouling bryozoan Dakaira subovoidea has been shown to contain two thiophene compounds, 1 -hydroxymethyl-6-oxo-6//-anthra[ 1,9-... 

Both synthesis and properties of functionalized pentacene and anthra-dithiophene 447 were reported (05JA4986 06MI3708). Anthradithiophenes functionalized on the thiophene ring were reported to yield good hole mobility from vapor-deposited films (on order of 0.1 cm2 V [ s [). Acenedithiophenes with absorption at 653 nm have been reported (04OL3325). Tetrathiophene anthracene derivatives have been described showing absorption at 431 nm and emission at 437 nm (07OL4187). 

A variant on this reaction makes use of l-anilino-l-methylmercapto-2-nitroethylene as the nitro-synthon. This leads to the 2-anilino-3-nitro-quinolines 88.7S The reaction is best carried out in acetic acid. The condensed thiophene derivatives 89 have been prepared similarly. The use of anthra-... 

Anthraquinone dyes, 1, 331-332 Anthra[ 1,2-c][ 1,2,5]selenadiazole-6,11 -dione X-ray crystal structure, 6, 516 Anthra[2,3-6]thiophenes synthesis, 4, 905 Anthrazoline polymers, 1, 297 Anthrone, pyrazolo-, 1, 320 Anthrones, 1, 336-337... 

Cumulative Index of Heterocyclic Systems Anthra[l,2- ]thiophene (21)... 

Dihydroxy-6-oxo-6 -anthra[l,9- c] thiophene-1-carboxylic acid Me ester, in D-20151... 

Anthra[l, 2-ft]benzo[[Pg.666]

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