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642089-49-4

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642089-49-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 642089-49-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,2,0,8 and 9 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 642089-49:
(8*6)+(7*4)+(6*2)+(5*0)+(4*8)+(3*9)+(2*4)+(1*9)=164
164 % 10 = 4
So 642089-49-4 is a valid CAS Registry Number.

642089-49-4Relevant articles and documents

Synthesis of 1,3-thioxoketones from salicylaldehyde

Semenova,Yarovenko,Levchenko,Krayushkin

, p. 1022 - 1025 (2014/03/21)

A method for the synthesis of monothiodibenzoylmethanes was developed. The method involves a reaction of potassium thioacetate with 1-(2-hydroxyphenyl)-3- phenylpropynone prepared from salicylaldehyde.

Synthesis of 2-(Diarylmethylene)-3-benzofuranones Promoted via Palladium-Catalyzed Reactions of Aryl iodides with 3-Aryl-1-(2-tert- butyldimethylsilyloxy)phenyl-2-propyn-1-ones

Lin, Chi-Fong,Lu, Wen-Der,Wang, I.-Wen,Wu, Ming-Jung

, p. 2057 - 2061 (2007/10/03)

3-Substituted-1-(2-tert-butyldimethylsilyloxy)phenyl-2-propyn-1-ones were coupled with aryl iodides by using palladium as a catalyst in ambient MeOH solution and gave 2-(diarylmethylene)-3-benzofuranones in moderate to good yields.

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