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21209-49-4

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21209-49-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21209-49-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,2,0 and 9 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 21209-49:
(7*2)+(6*1)+(5*2)+(4*0)+(3*9)+(2*4)+(1*9)=74
74 % 10 = 4
So 21209-49-4 is a valid CAS Registry Number.

21209-49-4Upstream product

21209-49-4Relevant articles and documents

Use of 2-pyrimidine thiol carbonates as acylating agents for amino or imino containing compounds

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, (2008/06/13)

Thiolcarbonates represented by the formula, SPC1 Wherein R1 and R2 are individually a hydrogen atom or a methyl group, and R3 is a straight chain or branched chain saturated or unsaturated alkyl group having 1 to 5 carbon atoms or is a benzyl or benzhydryl group which may be nuclear substituted, are quite useful for protecting the amino or imino groups of amines, hydrazines, amino acids and peptides with groups of the formula EQU1 The thiolcarbonates can be easily produced by reacting an alkali metal salt of 2-mercaptopyrimidine with phosgene, and reacting the resulting thiolchloroformate with an alcohol (R3 OH), or by reacting a 2-mercaptopyrimidine with a halocarbonic acid ester.

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