Cas 71443-54-4,1,5-dimethyl-4-phenylethynyl-1H-pyrazole

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Check Digit Verification of cas no

The CAS Registry Mumber 71443-54-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,4,4 and 3 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 71443-54:
(7*7)+(6*1)+(5*4)+(4*4)+(3*3)+(2*5)+(1*4)=114
114 % 10 = 4
So 71443-54-4 is a valid CAS Registry Number.

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71443-54-4Relevant articles and documents

Synthesis of unsymmetrical hetaryl-1,2-diketones

Yusubov, Mehman S,Zholobova, Galina A,Vasilevsky, Sergey F,Tretyakov, Eugene V,Knight, David W

, p. 1607 - 1610 (2002)

Oxidation of the triple bond in 4-alkynylpyrazoles 2a-e and acetylenic derivatives of the crown-ethers 7a,b with PdCl2-DMSO has been carried out to give unsymmetrical hetaryl-1,2-diketones 3a-e; 8a,b. Attempts to oxidize the triple bond in 5-alkynylpyrazole 6 and alkynylpyridines 5a,b and 9 failed.

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71443-54-4