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173549-40-1

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173549-40-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 173549-40-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,3,5,4 and 9 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 173549-40:
(8*1)+(7*7)+(6*3)+(5*5)+(4*4)+(3*9)+(2*4)+(1*0)=151
151 % 10 = 1
So 173549-40-1 is a valid CAS Registry Number.

173549-40-1Relevant articles and documents

On the Preparation of N-Acylpyrroles and their Use in the Synthesis of Ketones

Brandaenge, Svante,Holmgren, Erik,Leijonmarck, Hans,Rodriguez, Benito

, p. 922 - 928 (2007/10/03)

Two methods for the preparation of N-acylpyrroles have been studied: (a) the reaction between pyrrole and N-acylimidazoles and (b) the oxidation of amides of 3-pyrroline.The reactions between N-acylpyrroles and organolithium compounds can be directed to give ketones in good yields.The initially formed tetrahedral intermediates in these reactions are relatively stable and pyrrolylcarbinols are isolable intermediates.A Reformatsky-Claisen type ring-closure gave a more than doubled yield when an N-acylpyrrole group was used as an electrophile instead of an ester group; the increased stability of the initially formed tetrahedral intermediate presumably accounts for the observed results.

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