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87894-66-4

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87894-66-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 87894-66-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,8,9 and 4 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 87894-66:
(7*8)+(6*7)+(5*8)+(4*9)+(3*4)+(2*6)+(1*6)=204
204 % 10 = 4
So 87894-66-4 is a valid CAS Registry Number.

87894-66-4Relevant articles and documents

Thiopyranobenzothiophens. Synthesis of 1-Phenyl-3H-thiopyranobenzothiophen-3-thione 9,9-Dioxide and Related Compounds

Buggle, Katherine,Ghogain, Una Ni,Nangle, Michael,MacManus, Patrick

, p. 1427 - 1429 (2007/10/02)

The title compound (3a) was prepared by the reaction of 2-benzoylbenzothiophen-3(2H)-one 1,1-dioxide (1) with tetraphosphorus decasulphide, acetonitrile, and sodium hydrogen carbonate.The structure was confirmed by an alternative synthesis from ethyl 3-benzothienylacetate.The isomeric 4-phenyl-2H-thiopyranobenzothiophen-2-thione 5,5-dioxide (2a) and a number of analogues of (3a) and (2a) were prepared.

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