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139926-43-5

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139926-43-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 139926-43-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,9,2 and 6 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 139926-43:
(8*1)+(7*3)+(6*9)+(5*9)+(4*2)+(3*6)+(2*4)+(1*3)=165
165 % 10 = 5
So 139926-43-5 is a valid CAS Registry Number.

139926-43-5Relevant articles and documents

Stereoselective synthesis of enynes by nickel-catalyzed cross-coupling of divinylic chalcogenides with alkynes

Silveira, Claudio C.,Braga, Antonio L.,Vieira, Adriano S.,Zeni, Gilson

, p. 662 - 665 (2003)

(Z,Z)- and (E,E)-divinylic selenides and telurides undergo direct coupling with terminal alkynes in the presence of a nickel/CuI catalyst at room temperature to give (Z)- and (E)-enyne systems in good yields and with complete retention of configuration.

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