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1257228-77-5

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1257228-77-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1257228-77-5 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,5,7,2,2 and 8 respectively; the second part has 2 digits, 7 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 1257228-77:
(9*1)+(8*2)+(7*5)+(6*7)+(5*2)+(4*2)+(3*8)+(2*7)+(1*7)=165
165 % 10 = 5
So 1257228-77-5 is a valid CAS Registry Number.

1257228-77-5Upstream product

1257228-77-5Downstream Products

1257228-77-5Relevant articles and documents

Amine-catalyzed asymmetric (3 + 3) annulations of β′-acetoxy allenoates: Enantioselective synthesis of 4H-pyrans

Ni, Chunjie,Tong, Xiaofeng

supporting information, p. 7872 - 7875 (2016/07/07)

The asymmetric (3 + 3) annulations of β′-acetoxy allenoates with either 3-oxo-nitriles or pyrazolones have been realized by using 6′-deoxy-6′-[(l)-N,N-(2,2′-oxidiethyl)-valine amido]quinine (6h) as the catalyst. The three functions of catalyst 6h, including Lewis base (quinuclidine N), H-bond donor (amide NH), and Br?nsted base (morpholine N), cooperatively take crucial roles on the chemo- and enantioselectivity, allowing for the construction of 4H-pyran and 4H-pyrano[2,3-c]pyrazole in high yields and enantioselectivity.

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