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172660-93-4

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172660-93-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 172660-93-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,2,6,6 and 0 respectively; the second part has 2 digits, 9 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 172660-93:
(8*1)+(7*7)+(6*2)+(5*6)+(4*6)+(3*0)+(2*9)+(1*3)=144
144 % 10 = 4
So 172660-93-4 is a valid CAS Registry Number.

172660-93-4Relevant articles and documents

A facile synthesis of carboxamides by dehydration condensation between free carboxylic acids and amines using O,O′-DI(2-pyridyl) thiocarbonate as a coupling reagent

Shiina, Isamu,Saitoh, Katsuyuki,Nakano, Masakazu,Suenaga, Yoshihito,Mukaiyama, Teruaki

, p. 621 - 630 (2000)

Carboxamides are prepared in high yields by dehydration condensation between nearly equimolar amounts of free carboxylic acids and amines both of which involve secondary or tertiary alkyl substituted ones with O,O′-di(2-pyridyl) thiocarbonate, a coupling reagent, in the presence of a catalytic amount of 4-(dimethylamino)pyridine.

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