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99821-84-8

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99821-84-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 99821-84-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,8,2 and 1 respectively; the second part has 2 digits, 8 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 99821-84:
(7*9)+(6*9)+(5*8)+(4*2)+(3*1)+(2*8)+(1*4)=188
188 % 10 = 8
So 99821-84-8 is a valid CAS Registry Number.

99821-84-8Relevant articles and documents

The Chemistry of the Insoluble Red Woods. Part 16. Some Further Observations on the Condensation of Isoflavylium Salts with 1,3-Diphenylpropenes

Afonya, Theophilus C. A.,Epelle, Faithwin B. M.,Osman, Soad A. A.,Whalley, W. Basil

, p. 3301 - 3312 (2007/10/02)

Condensation of 7-benzyloxy-6,2',3',4'-tetramethoxyisoflavylium perchlorate (1; R = PhCH2) with 1-(3,4-dimethoxyphenyl)-3-(2,4-dimethoxyphenyl)prop-1-ene (2) and with its isomeric propene gave derivatives provisionally formulated as the 6-benzyl-5-phenylbenzoxanthenes (type 6; R1=OMe, R2= PhCH2) analogous to the xanthenes derivable from per-O-methylsantarubin and per-O-methylsantalin, respectively.

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