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1,4,7,10-tetramethyl-5,6-didehydrodibenzo [a,e]cyclooctene

✍ Scribed by Mei-Kuen Au; Tak-Wai Siu; Thomas C.W. Mak; Tze-Lock Chan

Publisher
Elsevier Science
Year
1978
Tongue
French
Weight
176 KB
Volume
19
Category
Article
ISSN
0040-4039

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✦ Synopsis

We report the synthesis and structural characterization of the title compound (z), the first known derivative of the intriguing dibenz-annelated planar conjugated eight-membered ring system'. Unlike its parent compound, hydrocarbon 2 was found to be thermally stable, undergoing no detectable decomposition at room temperature for periods up to several months. Reaction of 2,3-bis(bromomethyl)-P-xylene (l_) with 2,3-bis(mercaptomethyl)-Pxylene (2) in the presence of KOH in benzene-ethanol gave 1,4,8,11-tetramethyl-5,7,12,14-tetrahyd~odibenso[c,h][l,6]dithiecine (z)2, m.p. 218-220Β°, in 60% yield. Oxidation HS CH3 HS KOH, C~HI -EtOH

πŸ“œ SIMILAR VOLUMES

1,4,7,10-tetramethyl-5,6-didehydrodibenz
1,4,7,10-tetramethyl-5,6-didehydrodibenzo[a,e]cyclooctene. A presumably planar fully conjugated eight-membered ring compound.
✍ Nai Zheng Huang; Jian Hua Jia; Li Li Wang; Tze-Lock Chan; Thomas C.W. Mak πŸ“‚ Article πŸ“… 1982 πŸ› Elsevier Science 🌐 French βš– 401 KB

Swmary. The first known stable crystaZline derivative of 5,6-didehydrodibenzo[a,e]eycZooctene 111, namely, 1,4,7,lO-tetramethyZ-5,6-didehydrodibenzo[a,e]cycZooctene (21, was prepared and unequivocalZy characterised.

1,4,7,10-Tetraphenyl-dibenzo[a,e]cyclooc
1,4,7,10-Tetraphenyl-dibenzo[a,e]cycloocten-5,6,11,12-tetron aus 3,6-Diphenyl-phthalsΓ€ureanhydrid
✍ Priv.-Doz. Dr. Theodor Troll; Dr. Georg W. Ollmann; Helga Leffler πŸ“‚ Article πŸ“… 1984 πŸ› John Wiley and Sons 🌐 English βš– 225 KB

2a ~f 2b ist von groBem theoretischem Interesse'll. Bisher war nur der indirekte Nachweis des Diphenyl-['l und des Bis(dialkylamin~)-Derivats~~~ durch Abfangreaktionen gelungen. Wir berichten uber die blitzthermolytische Eneugung und Matrixisolierung von Cyclopropenyliden 2. Das Vorliegen von Cyclop