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13638-74-9

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13638-74-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 13638-74-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,3,6,3 and 8 respectively; the second part has 2 digits, 7 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 13638-74:
(7*1)+(6*3)+(5*6)+(4*3)+(3*8)+(2*7)+(1*4)=109
109 % 10 = 9
So 13638-74-9 is a valid CAS Registry Number.

13638-74-9Upstream product

13638-74-9Downstream Products

13638-74-9Relevant articles and documents

METHOD OF PRODUCING β-MERCAPTOCARBOXYLIC ACIDS

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Page/Page column 31-32, (2009/04/25)

The invention relates to a method for efficiently producing β-mercaptocarboxylic acids using a solid acid catalyst such as zeolite, which product corresponds to respective starting materials selected from α, β-unsaturated carboxylic acids (α, β-unsaturated carboxylic acid, a, β-unsaturated carboxylic acid ester, ex, β-unsaturated amide, a, β-unsaturated aldehide and α, β-unsaturated ketone) and hydrogen sulfides (hydrogen sulfide, sulfide salt and hydrosulfide salt), wherein a solvent compatible with water is used in the reaction. According to the invention, β-mercaptocarboxylic acids which are useful as additives in synthetic materials for pharmaceutical or agricultural agents and in polymer compounds can be industrially produced efficiently by using easily available a, β-unsaturated carboxylic acid (such as crotonic acid) at high yield.

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