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19566-63-3

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19566-63-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 19566-63-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,5,6 and 6 respectively; the second part has 2 digits, 6 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 19566-63:
(7*1)+(6*9)+(5*5)+(4*6)+(3*6)+(2*6)+(1*3)=143
143 % 10 = 3
So 19566-63-3 is a valid CAS Registry Number.

19566-63-3Downstream Products

19566-63-3Relevant articles and documents

Selective Preparation. 37. Bromination of 2,2',-Dihydoxy-3,3',5,5'-tetra-tert-butylbiphenyl and Preparation of Hydroxydibenzofurans

Tashiro, Masashi,Yoshiya, Haruo,Fukata, Gouki

, p. 4425 - 4429 (2007/10/02)

Treatment of 2,2'-dihydroxy-3,3',5,5'-tetra-tert-butylbiphenyl (3) with excess bromine in alcohols afforded the 2-alkoxy-1-bromo-4,6,8-tri-tert-butyldibenzofurans 6a,b in 68 percent and 44 percent yields, respectively.When compound 6a was treated with AlCl3 in boiling toluene, 2-hydroxydibenzofuran (14) was obtained in 79 percent yield together with bromotoluenes (15) and tert-butyltoluenes (10).However, at room temperature, this reaction afforded 1-bromo-2-methoxy-4-tert-butyldibenzofuran (16) in 74 percent yield.Futhermore, it was found that AlCl3-CH3NO2-catalyzed reaction of 6a in toluene gave 1-bromo-2-methoxy-4,6-di-tert-butyldibenzofuran (17) in 71 percent yield together with 10.From 6a were obtained 1,2,8-trihydroxy-(26) and 1,2,7,8-tetrahydroxydibenzofuran (27) in several steps.

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