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131784-69-5

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131784-69-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 131784-69-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,7,8 and 4 respectively; the second part has 2 digits, 6 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 131784-69:
(8*1)+(7*3)+(6*1)+(5*7)+(4*8)+(3*4)+(2*6)+(1*9)=135
135 % 10 = 5
So 131784-69-5 is a valid CAS Registry Number.

131784-69-5Relevant articles and documents

Catalytic Asymmetric Diels-Alder Reaction of Quinone Imine Ketals: A Site-Divergent Approach

Hashimoto, Takuya,Nakatsu, Hiroki,Maruoka, Keiji

, p. 4617 - 4621 (2015)

The catalytic asymmetric Diels-Alder reaction of quinone imine ketals with diene carbamates catalyzed by axially chiral dicarboxylic acids is reported herein. A variety of primary and secondary alkyl-substituted quinone derivatives which have not been applied in previous asymmetric quinone Diels-Alder reactions could be employed using this method. More importantly, we succeeded in developing a strategy to divert the reaction site in unsymmetrical 3-alkyl quinone imine ketals from the inherently favored unsubstituted C=C bond to the disfavored alkyl-substituted C=C bond.

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