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33978-66-4

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33978-66-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 33978-66-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,3,9,7 and 8 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 33978-66:
(7*3)+(6*3)+(5*9)+(4*7)+(3*8)+(2*6)+(1*6)=154
154 % 10 = 4
So 33978-66-4 is a valid CAS Registry Number.

33978-66-4Relevant 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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