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15494-42-5

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15494-42-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 15494-42-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,5,4,9 and 4 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 15494-42:
(7*1)+(6*5)+(5*4)+(4*9)+(3*4)+(2*4)+(1*2)=115
115 % 10 = 5
So 15494-42-5 is a valid CAS Registry Number.

15494-42-5Relevant articles and documents

A benzo b furyl ketone dye synthesis method (by machine translation)

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Paragraph 0024; 0028; 0032, (2018/09/11)

The invention relates to a of benzodifaradone dye synthesis method, first to the manufacture of chlorine list alkyl esters, aromatic hydrocarbon as the raw material for Friedel-crafts reaction intermediates 1 or 1 ', then the intermediate 1, intermediate 1' hydrogenation reduction for preparing intermediate 2 and intermediate 2 ', intermediate 2 with condensation product of [...] intermediate 3 with the intermediate 2' condensation reaction to produce intermediate 4, intermediate 4 is oxidized to obtain the benzo b butenolides. The present invention provides a process for synthesis of low cost, low risk, low pollution, the process route is simple without a separate purification process; production and cheap, the cost is far lower than the existing technology, and the product higher total yield can be up to 69%, content is greater than 98.5%, has extremely high economic efficiency, and is suitable for large-scale production, it has good industrial application prospect. (by machine translation)

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