Council of Scientific and Industrial Research

Sumit Chaurasia

Atul Goel

Amit Kumar

Girish Kumar Jain

Vijay Kumar

Anil Kumar Dwivedi

Naibedya Chattopadhyay

Man Mohan Singh

Ritu Trivedi

Divya Singh

Lakshmi Manickavasagam

Sundar Manoharan

R S Anand

Abnish Kumar Gautam

Rashmi Pandey

The present invention relates to novel donor-acceptor fluorene compounds, which can be used as for the fabrication of electroluminescent devices, and a process of preparing said novel compounds. More particularly, the present invention relates to amine donor and nitrile/ester acceptor fluorenes, fluorenones their &#x3c0;-conjugated systems and related compounds, processes for preparing the said compounds including oxidation of fluorenes to corresponding fluorenones and their use in preparing organic electronic devices such as organic light emitting diodes (OLEDs), photovoltaic/solar cell, Field effect transistors and other useful electroluminescent devices. The compounds are prepared by reacting 2H-pyran-2-ones in isolated or rigid conformations with cyclic ketones containing methylene carbonyl moiety in the presence of a base in an organic solvent. The present invention also relates to a new concept and approach to overcome the problem of 'Green emission defect' in 9-unsubstituted fluorene-based organic light emitting diodes which occurs due to the conversion of fluorenes to fluorenones that show emission mainly in green-yellow region. In the present invention we have placed donor-acceptor substituents in such a way that donor-acceptor fluorenones show emission in the blue region (instead of green-yellow region) thus improving the blue color purity and overcoming the problem of green emission defect.

Donor-acceptor fluorene scaffolds: a process and uses thereof

The present invention relates to novel substituted benzfurochromenes and related compounds having the general formula (I), salts and chiral, achiral derivatives thereof; wherein R, R, R, R, R, R, R, Rare independently selected from the groups consisting of hydrogen, optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkoxyl, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted alkylthio, optionally substituted amino, optionally substituted acylamino, optionally substituted arylamino, optionally substituted acylthio, optionally substituted acyl, optionally substituted aroyl, optionally substituted acyloxy, optionally substituted thioamido, halogens, nitriles, esters, hydroxy, mercapto, carbontrifluoride, nitro but not limited to this; wherein RRor RRor RRmay be connected and form either a five membered ring or a six membered ring such as optionally substituted furan, optionally substituted dihydrofuran, optionally substituted pyran; or may be connected through a methylenedeoxy moiety; wherein X is selected from the units consisting of optionally a ketone group, optionally a methylene group, optionally substituted methylene group, optionally substituted alkene; wherein Y and Z is selected from the units consisting of CH, C&#x2014;OH, C-Me, C&#x2014;OMe with the proviso that bond between Y and Z is a single bond; Wherein Y and Z may be a carbon atom with the proviso that bond between Y and Z is a double bond. The compounds of the general formula is useful for the prevention and treatment of bone related disorders. 

Substituted benzfurochromenes and related compounds for the prevention and treatment of bone related disorders

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Lucknow, India

Sumit Chaurasia