32157-72-5Relevant academic research and scientific papers
Ultrasonic assisted dimeric cinchona based chiral phase transfer catalysts for highly enanatioselective synthesis of epoxidation of α,β-unsaturated ketones
Sivamani, Jayaraman,Ashokkumar, Veeramanoharan,Sadhasivam, Velu,Duraimurugan, Kumaraguru,Siva, Ayyanar
, p. 60293 - 60299 (2014)
New types of bis-quaternary ammonium bromide as chiral multisite phase transfer catalysts derived from cinchona alkaloids have been developed and evaluated for the enantioselective epoxidation of chalcones in the presence of lower concentrations of various oxidants, bases and ultrasonic irradiation conditions. Under optimized conditions, excellent chemical yields of up to 98% along with the highest enantioselectivities of about 98% were obtained by using the reported catalysts.
A new class of bifunctional chiral phase transfer catalysts for highly enantioselective asymmetric epoxidation of α,β-unsaturated ketones at ambient temperature
Ashokkumar, Veeramanoharan,Balasaravanan, Rajendiran,Sadhasivam, Velu,Jenofar, Seenisultanmaideen Mehtob,Siva, Ayyanar
, p. 127 - 136 (2015/09/15)
A new type of bis-quaternary ammonium bromide as chiral multifunctional phase transfer catalysts derived from readily available inexpensive cinchona alkaloids has been developed and evaluated for the enantioselective asymmetric epoxidation of various chalcones in the presence of lower concentrations of various oxidants, bases, solvents and ambient temperature conditions. Under optimized reaction conditions, highest chemical yields of up to 98% along with the excellent enantioselectivities of about 99% were obtained by using the cinchona based chiral multifunctional phase transfer catalysts.
