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181648-03-3

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181648-03-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 181648-03-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,1,6,4 and 8 respectively; the second part has 2 digits, 0 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 181648-03:
(8*1)+(7*8)+(6*1)+(5*6)+(4*4)+(3*8)+(2*0)+(1*3)=143
143 % 10 = 3
So 181648-03-3 is a valid CAS Registry Number.

181648-03-3Upstream product

181648-03-3Relevant articles and documents

Synthesis of 3-deuterated diazepam and nordiazepam 4-oxides and their use in the synthesis of other 3-deuterated derivatives

Yang, Shen K.,Tang, Ren,Pu, Quan-Long

, p. 753 - 759 (1996)

The protons at 3-positions of diazepam 4-oxide and nordiazepam 4-oxide underwent an efficient deuterium exchange via keto-enol tautomerism in deuterated alkaline methanol. The 3-dideuterated 4-oxides were each used as a starting material to synthesize 3-monodeuterated oxazepam and its 3-acetate, 3-monodeuterated temazepam and its 3-acetate, and 3-dideuterated diazepam and nordiazepam.

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