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904320-55-4

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904320-55-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 904320-55-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,0,4,3,2 and 0 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 904320-55:
(8*9)+(7*0)+(6*4)+(5*3)+(4*2)+(3*0)+(2*5)+(1*5)=134
134 % 10 = 4
So 904320-55-4 is a valid CAS Registry Number.

904320-55-4Downstream Products

904320-55-4Relevant articles and documents

Hydroheteroarylation of alkynes under mild nickel catalysis

Nakao, Yoshiaki,Kanyiva, Kyalo Stephen,Oda, Shinichi,Hiyama, Tamejiro

, p. 8146 - 8147 (2006)

Nickel complexes having a bulky tri(sec-alkyl)phosphine ligand catalyze hydroheteroarylation of alkynes at 35 °C. Selective activation of an Ar-H bond over an Ar-CN bond of N-protected 3-cyanoindoles is achieved by a proper choice of ligand and/or an N-protecting group. The catalysis is applicable to a diverse range of heteroarenes to afford cis-hydroheteroarylation products in highly chemo- and stereoselective manners. Excellent regioselectivity is observed with unsymmetrical alkynes to give the corresponding heteroaryl-substituted ethenes having a larger substituent trans to an aryl group. Copyright

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