118267-01-9

Upstream product

• 31273-58-2 1-(7-hydroxy-2,2-dimethylchroman-6-yl)ethanone 
• 123-08-0 4-hydroxy-benzaldehyde 
• 28448-85-3 buroussochalcone B 
• 89-84-9 2',4'-dihydroxy-4-acetophenone 
• 28437-37-8 5-C-prenylresacetophenone 
• 108-46-3 recorcinol 

Downstream Products

• 415921-46-9 8-[3-(3-methyl-2-butenyl)-4-hydroxyphenyl]-2,2-dimethyl-3,4,7,8-tetrahydro-2H,6H-benzo[1,2-b:5,4-b']dipyran-6-one 
• 415921-45-8 8-(4-hydroxyphenyl)-2,2-dimethyl-3,4,7,8-tetrahydro-2H,6H-benzo[1,2-b:5,4-b']dipyran-6-one 

Relevant academic research and scientific papers

Activation of phenolic oxygen atom using polyphosphoric acid: Synthesis of carbonyl-containing dihydrobenzofurans/dihydrobenzopyrans

Carbonyl-containing dihydrobenzofurans/dihydrobenzopyrans were prepared from carbonyl-containing ortho-allyl/prenylphenols by activation of phenolic oxygen atom using polyphosphoric acid (PPA). Various substrates were investigated, and the corresponding d

BF3-Et2O mediated biogenetic type synthesis of chromanochalcones from prenylated chalcones via a regioselective cyclization reaction

In continuation of our program on synthetic chalcones, we have developed a simple and convenient method for the synthesis of chromanochalcones from prenylated chalcones in high yields by regioselective cyclization using BF3-Et2O.

Synthesis, characterisation of new chromanoisoxazoles and investigation of optical power limiting properties

Five new chromanoisoxazoles are prepared by the common (3+2) route. Chalcones on condensation with hydroxylamine hydrochloride furnish 3-substituted phenyl-5-(2″,2″-dimethyl-7″ -hydroxychroman)isoxazoles. Chalcones, have been prepared from resorcinol by acetylation. Resacetophenone thus formed on nuclear prenylation with isoprene/PPA affords 7-hydroxy-6-acetyl-2′,2′-dimethylchroman. This on treatment with substituted benzaldehydes forms chalcones 1-5. Compounds 1-5 react with hydroxylamine hydrochloride in the presence of KOH/EtOH resulting in the formation of chromano isoxazoles 6-10, which are identified and characterized by IR, 1H NMR, 13C NMR and mass spectral data. The physico-chemical parameters (absorbance and fluorescence) have been studied for two newly synthesized isoxazoles. Besides the above studies, the optical power limiting performances have also been measured at 532 nm with nano second pulses for the above isoxazoles. The variation of the transmitted power corresponding to the incident power showed a decrease in the transmitted power to a greater extent. The curve corresponding to 7 mm solution path shows that the transmitted power gets saturated with the input intensity which shows the optical limiting behaviour.

Synthetic confirmation for the structure of stipulin

A new diprenylated chalcone, stipulin 1 (5′, 3-di-isopentenyl-2′,4′,4-trihydroxychalcone) has been characterized from the roots of Dalbergia stipulacea. Synthesis of 8-(2,2-dimethyl-3,4-dihydro-2H-1 -benzopyran-6-yl)-2,2-dimethyl-3,4,7,8-tetrahydro-2H, 6H

13C Nuclear Magnetic Resonance Studies on Pyrano- and Dihydropyrano-1,3-diphenylprop-2-enones

The 13C NMR spectra of 19 differently substituted pyrano- and dihydropyrano-1,3-diphenylprop-2-enones were recorded and the results are discussed.The data will be useful in the identification of new and natural chalcones. Key Words: Chalcones - 1,3-Diphen