Cas 74458-90-5,2-hexanoyl-6,7-dihydrobenzo<b>thiophen-4(5H)one

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Check Digit Verification of cas no

The CAS Registry Mumber 74458-90-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,4,5 and 8 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 74458-90:
(7*7)+(6*4)+(5*4)+(4*5)+(3*8)+(2*9)+(1*0)=155
155 % 10 = 5
So 74458-90-5 is a valid CAS Registry Number.

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74458-90-5Relevant articles and documents

Studies on Sulphur Heterocycles. Reactions of 6,7-Dihydrobenzothiophen-4(5H)one Derivatives and their Conversion to 7-Substituted Thienobenzopyran-8-ones

Asprou, Chris M.,Brunskill, John S. A.,Jeffrey, Howard,De, Asish

, p. 87 - 92 (2007/10/02)

Cyclization of γ-(2-thienyl)butyric acid with acid anhydrides gives 2-acyl derivatives as well as the expected 6,7-dihydrobenzothiophen-4(5H)one.Several reactions of these ketones have been studied including their conversion to O,O-diethyl thiophosphon

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74458-90-5