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67134-56-9

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67134-56-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 67134-56-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,7,1,3 and 4 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 67134-56:
(7*6)+(6*7)+(5*1)+(4*3)+(3*4)+(2*5)+(1*6)=129
129 % 10 = 9
So 67134-56-9 is a valid CAS Registry Number.

67134-56-9Downstream Products

67134-56-9Relevant articles and documents

Copper-Catalyzed (4+1) Cascade Annulation of Terminal Alkynes with 2-(Tosylmethyl)anilines: Synthesis of 2,3-Disubstituted Indoles

Yan, Xu,Liu, Chun-Fang,An, Xian-Tao,Ge, Xiao-Min,Zhang, Qing,Pang, Lin-Han,Bao, Xu,Fan, Chun-An

supporting information, p. 8905 - 8909 (2021/11/24)

A novel strategy based on Cu-catalyzed (4+1) cascade annulation of terminal alkynes as one-carbon synthons with 2-(tosylmethyl)anilines has been developed for the expeditious synthesis of 2,3-disubstituted indoles, in which in situ generations of aza-o-quinone methides and alkynyl-copper(I) species are involved. This annulation provides an effective method for the assembly of synthetically and structurally interesting 2,3-disubstituted indoles.

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