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617699-97-5

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617699-97-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 617699-97-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,1,7,6,9 and 9 respectively; the second part has 2 digits, 9 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 617699-97:
(8*6)+(7*1)+(6*7)+(5*6)+(4*9)+(3*9)+(2*9)+(1*7)=215
215 % 10 = 5
So 617699-97-5 is a valid CAS Registry Number.

617699-97-5Upstream product

617699-97-5Relevant articles and documents

Synthesis of a tritium-labeled, fipronil-based, highly potent, photoaffinity probe for the GABA receptor

Sammelsont, Robert E.,Casida, John E.

, p. 8075 - 8079 (2003)

3-{4-[1-(2,6-Dichloro-4-trifluoromethylphenyl)pyrazolo]} -3-(trifluoromethyl)diazirine is a fipronil-based (i.e. fiprole), high-affinity probe for the GABA receptor. For synthesis of the tritium-labeled version of this trifluoromethyldiazirinylfiprole ([3H]TDF) the required intermediate, 3-{4-[1-(2,6-dichloro-3-iodo-4-trifluoromethylphenyl)-5-iodopyrazolo]} -3-(trifluoromethyl)diazirine, was prepared in 10 steps from pyrazole and 3,5-dichloro-4-fluorobenzotrifluoride. One of the key transformations was lithiation and subsequent iodination of the 4-(2,2,2-trifluoro-1-hydroxyethyl)pyrazole intermediate. The last step involved reduction of the diiodofiprole with tritium, Pd/C, and triethylamine in ethyl acetate and afforded [3H]TDF with a specific activity of 15 Ci/mmol and 99% radiopurity.

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