Ecofriendly bromination of chalcones and synthesis of flavones using grinding technique
Selective bromination of chalcones and 2'-hydroxychalcones has been carried out with ammonium bromide and ammonium persulphate using grinding technique at RT under aqueous moist condition to give α,β-dibromochalcones and α,β-dibromo-2'- hydroxychalcones respectively. α,β- Dibromo-2'-hydroxychalcones have been cyclodehydrobrominated with barium hydroxide moist and ethanol at RT to give flavones using grinding technique.
Jakhar, Komal,Makrandi
p. 141 - 145
(2013/02/23)
Synthesis of pyrazole and isoxazole in triethanolamine medium
Reactions of 2′-hydroxy chalcone dibromides 2a-1 with phenyl hydrazine and hydrazine hydrate afford pyrazoles 1a-1 and with hydroxylamine hydrochloride give isoxazoles 5a-f in triethanolamine medium. Similarly reaction of β-diketone 3b-e with phenyl hydra
Agrawal, Nitin N.,Soni
p. 532 - 534
(2008/09/18)
REACTION OF CHALOCONES WITH N-BROMOSUCCINIMIDE. SYNTHESIS OF AURONES
The reaction of 2'-OR-4-R1 chalcone with N-bromosuccinimide is reported.It was found that the structure of the product depends on the nature of the substituents R and R1.The prepared α-bromo-β-methoxydihydrochalcones were converted to the corresponding aurones.
Litkei, D.,Khilya, V. P.,Tokesh, A. L.,Antush, Sh.,Turov, A. V.
p. 432 - 440
(2007/10/03)
More Articles about upstream products of 39729-17-4