249512-73-0

Upstream product

• 54119-53-8 3,4-diphenylthiopnene 1,1-dioxide 
• 106-51-4 p-benzoquinone 
• 637-44-5 phenylpropyolic acid 
• 16939-13-2 3,4-diphenylthiophene 
• 134-81-6 benzil 
• 5587-78-0 4-hydroxy-3,4-diphenylcyclopent-2-en-1-one 

Downstream Products

• 682774-05-6 2,3,6,7-tetraphenyl-9,10-anthraquinone 
• 1254329-72-0 7,8-diphenyl-3,4-bis(phenylamino)-1-pyridin-2-yl-benzo[g]isoquinoline-5,10-dione 

Relevant academic research and scientific papers

Alkynyl triazenes enable divergent syntheses of 2-pyrones

The 2-pyrone motif occurs frequently in bioactive natural products and is appreciated as synthetic intermediates. However, only few methods allow for diversifying functional group modifications on this relevant heterocycle. The distinct properties of 1-alkynyl triazenes promote a smooth addition of propiolic acids across the triple bond. Addition of catalytic amounts of silver salt induces cyclization to 2-pyrones. Depending on the reaction temperature, either 6-triazenyl or 5-triazenyl 2-pyrones are selectively formed. The triazenyl unit is subsequently replaced by a variety of valuable groups in a one-pot process yielding for instance 2-fluoro pyrones. The substitution occurs with an intriguing 1,5-carbonyl transposition. Moreover, the triazenyl group serves as traceless activating group for subsequent Diels-Alder cycloadditions and as a constituting unit for rare fused aminopyrazole pyrone heterocycles.

An efficient synthesis of substituted anthraquinones and naphthoquinones

An efficient synthesis of 6,7-disubstituted naphthoquinones and 2,3,6,7-tetrasubstituted anthraquinones were developed using the reaction of thiophene dioxides and benzoquinone and naphthoquinone derivatives, respectively.

From enolates to anthraquinones

A series of highly reactive cyclopentadienones were prepared in situ from the corresponding hydroxycyclopent-2-enones and trapped with a variety of quinones. Reaction of 1,4-naphthoquinone with 4-hydroxy-3,4-diphenyl-cyclopent- 2-enone afforded 2,3-diphenylanthraquinone, whereas reaction of benzoquinone with this same cyclopentadienone precursor yielded a mixture of 6,7-dipheny 1-1,4-naphthoquinone and 2,3,6,7-tetraphenylanthraquinone. A number of other 2,3-diarylanthraquinones were likewise prepared in moderate yields from the reaction of 1,4-naphthoquinone with the appropriate 4-hydroxy-3,4- diarylcyclopent-2-enones. This method appears to be generally applicable to the synthesis of anthraquinone derivatives substituted at the 2- and 3-positions from inexpensive starting materials.

COMPOUNDS FOR ORGANIC EL ELEMENT AND ORGANIC EL ELEMENT

An object of the invention is to provide an organic EL device-forming compound and an organic EL device which produce light emission of satisfactory luminance, especially at long wavelength and are durable in that improved light emitting performance lasts for a long time. The object is attained by a compound having a basic skeleton represented by formula (I) and an organic EL device comprising the same. In formula (I), R1to R8each are hydrogen or a substituted or unsubstituted aryl or alkenyl group, with the proviso that at least six of R1to R8are substituted or unsubstituted aryl or alkenyl groups.