2,4,6-CYCLOHEPTATRIEN-l-ONE

Amino- and 5-amino-2,4,6-cycloheptatrien-l-ones were reacted with EMME at 140°C for 1.5-2.0 hr to afford (l-oxocycloheptatrien-2- and 5-ylamino)methylenemalonates (44 and 45) in good yields (83USP438I304, 83USP4382088). 

UV illumination of air-exposed solutions of compounds 16 and 17 results in elimination of the elemental tellurium to give 4,5-dibenzoylpiperazine in 40% yield and 4,5-dibenzoyl-2,7-diphenyl-2,4,6-cycloheptatrien-l-one in 43% yield (Scheme 13) <1976CB3886>. 

The complex functions as the most suitable source of the tricarbonylruthe-nium unit in syntheses of tricarbonyl(7-diene)ruthenium complexes. Derivatives of 1,3-cyclohexadiene, 1,3-cycloheptadiene, cycloheptatriene, cyclooc-tatetraene, 2,4,6-cycloheptatrien-l-one, bicyclo[3.2. l]octa-2,6-diene, bicyclo-[3.2. l]octa-2,4-diene, and butadiene have been prepared by displacement of 1,5-cyclooctadiene. 

The thermally induced [6 + 4] cycloaddition of 2,4,6-cycloheptatrien-l-one (tropone) (1) with a variety of diene pikers has played a central role in the development of the mechanistic precepts and preparative utility of the entire class of higher-order pericyclic processes. The relatively well-defined reaction parameters for these cycloadditions render diem particularly well-suited for the rqiid assembly of relatively complex polycyclic carbon arrays. 

Thujaplicins. CiqHijOj, Mr 164.20, colorless crystals. Monocyclic monoterpenes with the tropolone structure (2-hydroxy-2,4,6-cycloheptatrien-l-one) thatdif-... 

A. Massoudi, I. Amini, A. Ramazani, F. Z. Nasrabadi, Y. Ahmadi, Bull. Korean Chem. Soc. 2012, 33, 39-42. Four-component synthesis of 2-(V,V-diaIkylamino)-2,4-6-cycloheptatrien-l-one derivatives from tropolones, an isocyanide, a primary amine and an aldehyde via Ugi-Smiles coupling reaction. 

Updated Entry replacing P-02289 2-Hydroxy-5-(3-methyl-2-butenyl)-4- l-methylethenyl)-2,4,6-cycloheptatrien-l-one, 9CL 4-Isopropenyl-5-prenyltropolone. 6-Isopropenyl-5-prenyltropolone [552-96-5]... 

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