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4901-55-7

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4901-55-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 4901-55-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,9,0 and 1 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 4901-55:
(6*4)+(5*9)+(4*0)+(3*1)+(2*5)+(1*5)=87
87 % 10 = 7
So 4901-55-7 is a valid CAS Registry Number.

4901-55-7Relevant articles and documents

PREPARATION OF NAPHTHALENE DERIVATIVES BY REACTION OF BENZYNES WITH TIOPHENE-1,1-DIOXIDES

Nakayama, Juzo,Kuroda, Masami,Hoshino, Masamatsu

, p. 1233 - 1236 (2007/10/02)

The reaction of benzynes with thiophene-1,1-dioxides afford the Diels-Alder cycloadducts which spontaneously lose sulphur dioxide to give the corresponding naphthalene derivatives in moderate yields.Further reaction of benzyne with naphthalenes yielding dibenzobarrelenes is observed in a few cases.

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