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223769-26-4

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223769-26-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 223769-26-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,3,7,6 and 9 respectively; the second part has 2 digits, 2 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 223769-26:
(8*2)+(7*2)+(6*3)+(5*7)+(4*6)+(3*9)+(2*2)+(1*6)=144
144 % 10 = 4
So 223769-26-4 is a valid CAS Registry Number.

223769-26-4Downstream Products

223769-26-4Relevant articles and documents

Enantioselective synthesis of binaphthol derivatives by oxidative coupling of naphthol derivatives catalyzed by chiral diamine-copper complexes

Nakajima, Makoto,Miyoshi, Irie,Kanayama, Kumiko,Hashimoto, Shun-Ichi,Noji, Masahiro,Koga, Kenji

, p. 2264 - 2271 (2007/10/03)

A highly efficient process of aerobic oxidative coupling of 2-naphthol derivatives catalyzed by 1 mol % of Cu(OH)Cl·TMEDA has been developed. Enantioselective oxidative coupling of naphthols was achieved by the use of 10 mol % of chiral catalysts prepared from proline-derived diamines and cuprous chloride, affording the corresponding binaphthols in good enantioselectivities of up to 78% ee. The ester moiety at the 3-position of the substrate was found to be essential for the good asymmetric induction observed in the present coupling reaction.

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