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81842-51-5

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81842-51-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81842-51-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,8,4 and 2 respectively; the second part has 2 digits, 5 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 81842-51:
(7*8)+(6*1)+(5*8)+(4*4)+(3*2)+(2*5)+(1*1)=135
135 % 10 = 5
So 81842-51-5 is a valid CAS Registry Number.

81842-51-5Upstream product

81842-51-5Relevant articles and documents

Method for preparing aromatic secondary amino compound

-

, (2008/06/13)

Disclosed are (1) a method for preparing an aromatic secondary amino compound which comprises reacting an N-cyclohexylideneamino compound in the presence of a hydrogen moving catalyst and a hydrogen acceptor by the use of a sulfur-free polar solvent and/or a cocatalyst, and (2) a method for preparing an aromatic secondary amino compound which comprises reacting cyclohexanone or a nucleus-substituted cyclohexanone, an amine and a nitro compound corresponding to the amine in a sulfur-free polar solvent in the presence of a hydrogen moving catalyst, a cocatalyst being added or not added. In a further aspect, a method is provided for the preparation of aminodiphenylamine by reacting phenylenediamine and cyclohexanone in the presence of a hydrogen transfer catalyst in a sulfur-free polar solvent while using nitroaniline as a hydrogen acceptor.

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