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157368-88-2

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157368-88-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 157368-88-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,3,6 and 8 respectively; the second part has 2 digits, 8 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 157368-88:
(8*1)+(7*5)+(6*7)+(5*3)+(4*6)+(3*8)+(2*8)+(1*8)=172
172 % 10 = 2
So 157368-88-2 is a valid CAS Registry Number.

157368-88-2Relevant articles and documents

Bis-amidines as useful building blocks for heterofulvenes and -fulvalenes

Mueller,Beckert,Goerls

, p. 601 - 606 (2007/10/03)

An easily feasible synthesis for bis-amidines of type 3 was developed via an aminolysis reaction of imidoyl chlorides 1 with gaseous ammonia. Depending on the nature of the electrophilic cyclization reagent, these amidines show a different reactivity. On treatment with orthoesters, the fused imidazoles 5 were obtained which involved the participation of two different kinds of nitrogen atoms in the cyclization. In contrast to this, carboxylic acid chlorides are able to react selectively at the NH2-groups under formation of the fulvenoid 4H-imidazoles 6. The same regioselectivity was observed for chlorodimethylimmonium chloride thus leading, via the dimerization of cyclic orthoamides, to the 1,4,5,8-tetraazafulvalenes 8.

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