139448-83-2Relevant academic research and scientific papers
ORGANOPHOSPHORUS COMPOUNDS ACTION OF 2,4-BIS-(4-METHOXYPHENYL)-1,3,2,4-DITHIADIPHOSPHETANE-2,4-DISULFIDE (LAWESSON REAGENT) AND 2,4-BIS-(PHENYLTHIO)-1,3-DITHIA-2,4-DIPHOSPHETANE-2,4-DISULFIDE (JAPANESE REAGENT) ON FLAVONE, α-NAPHTHOFLAVONE AND β-NAPHTHOFLAVONE
Hafez, Taghrid S.
, p. 249 - 253 (2007/10/02)
Japanese reagent JR, 1b converts 2-phenyl-(5,6-benz)-γ-pyrone (flavone, 2a) into 2-phenyl-5,6-benzpyrane-4-thione 2b.Lawesson reagent LR, 1a converts 2-phenyl-7,8-benzo-1,4-chromone (α-naphthoflavone, 3a) and 2-phenyl-5,6-benzo-1,4-chromone (β-naphthoflavone 4a) into their corresponding thioketones 3b and 4b respectively.Thiation of 3a and 4a with Lawesson reagent, 1a can be induced photochemically to give 3b and 4b.Thiation of α-naphthoflavone 3a and β-naphthoflavone 4a with Japanese reagent JR, 1b is accompanied with ring opening at the heterocyclic oxygen atom of the γ-pyrone ring, to yield products 5 and 6 respectively.The given structures were based upon analytical, chemical and spectroscopic results. Key words: Lawesson reagent; Japanese reagent; thiation; γ-pyrones.
