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156835-40-4

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156835-40-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 156835-40-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,6,8,3 and 5 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 156835-40:
(8*1)+(7*5)+(6*6)+(5*8)+(4*3)+(3*5)+(2*4)+(1*0)=154
154 % 10 = 4
So 156835-40-4 is a valid CAS Registry Number.

156835-40-4Downstream Products

156835-40-4Relevant articles and documents

Nucleophilic coupling of alkali 2-naphthoxides with 1-bromo-2-naphthols. Ion-pairing and halogen dance in the formation of 1,1'-binaphthalene-2,2'-diols

Belohradsky, Martin,Holy, Petr,Zavada, Jiri

, p. 1853 - 1856 (2007/10/02)

A very pronounced effect of solvent and cation has been found in the investigated reaction, indicating that ion-pairing is indispensable in the product formation.A simple rationale has been provided assuming self-assembly of the complementary reactants driven by hydrogen bonding and ion-pairing interactions.Concomitantly, halogen exchange between the reaction partners has been demonstrated to be a concurrent pathway, resulting from the nucleophilic 2-napthoxide attack at the bromide terminus of the Cα-Br bond in the participating 1-bromo-2-naphthol.

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