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683234-73-3

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683234-73-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 683234-73-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,8,3,2,3 and 4 respectively; the second part has 2 digits, 7 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 683234-73:
(8*6)+(7*8)+(6*3)+(5*2)+(4*3)+(3*4)+(2*7)+(1*3)=173
173 % 10 = 3
So 683234-73-3 is a valid CAS Registry Number.

683234-73-3Relevant articles and documents

Unusual reactions of 2-aryl-4-(N,N-dimethylaminomethylene)-2-oxazolin5-ones with O-nucleophiles: Synthesis of 2-aryl-4-hydi oxymethylene- 2-oxazolin-5-ones

Singh, Kumar K.,Singh, Ram S.,Singh, Radhey M.

, p. 120 - 126 (2007/10/03)

The reactions of 2-aryl-4-(N,N-dimethyIaminomethylene)-2- oxazolin-5-ones 2 with aqueous or ethanolic KOH and sodium ethoxide lead to the formation of 2-aryl-4-hydroxymethylene-2-oxazolin-5ones 4, 1,5-bond remaining unaffected. However, the reactions of 2 with aqueous or methanolic KOH afford methyl 2-acylamino-3-dimethylaminopropenoates 9 along with 4. These observations are explained by the hard-soft acid-base (HSAB) principle. Further, compounds 9 on treatment with POCl3 in pyridine and ethanolic KOH give the corresponding cyclized products 2 and 4, respectively.

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