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trans-2,3-dihydro-3-nosyloxy-2-phenyl-4H-1-benzopyran-4-one is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.

70188-29-3

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70188-29-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 70188-29-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,0,1,8 and 8 respectively; the second part has 2 digits, 2 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 70188-29:
(7*7)+(6*0)+(5*1)+(4*8)+(3*8)+(2*2)+(1*9)=123
123 % 10 = 3
So 70188-29-3 is a valid CAS Registry Number.

70188-29-3Relevant academic research and scientific papers

Flavonoids. 43. Deprotonation-initiated Aryl Migration with Sulfur Dioxide Extrusion: A Route to 2,3-Dihydro-2,3-diaryl-3-hydroxy-4H-1-benzopyran-4-ones

Patonay, Tamas,Hegedues, Laszlo,Patonay-Peli, Erzsebet

, p. 145 - 151 (2007/10/02)

Treatment of trans-2,3-dihydro-2-aryl-3-nosyloxy-4H-1-benzopyran-4-ones with various bases afforded 2,3-dihydro-r-2-aryl-t-3-hydroxy-c-3-(4-nitrophenyl)-4H-1-benzopyran-4-ones in a deprotonation-initiated aryl migration followed by sulfur dioxide extrusion.In the presence of hydroxide and methoxide ions a secondary ring cleavage has also been observed.However, the reaction of trans-2,3-dihydro-2-aryl-3-nosyloxy-4H-1-benzopyran-4-ones with cyanide ions gave 2,3-dihydro-r-2-aryl-t-4-cyano-c-3,c-4-epoxy-4H-1-benzopyrans in a carbonyl attack of cyanide followed by an internal substitution reaction.

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