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133931-21-2

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133931-21-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 133931-21-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,3,9,3 and 1 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 133931-21:
(8*1)+(7*3)+(6*3)+(5*9)+(4*3)+(3*1)+(2*2)+(1*1)=112
112 % 10 = 2
So 133931-21-2 is a valid CAS Registry Number.

133931-21-2Downstream Products

133931-21-2Relevant articles and documents

Synthesis of polysubstituted indoles and indolines by means of zirconocene-stabilized benzyne complexes

Tidwell, Jeffrey H.,Buchwald, Stephen L.

, p. 11797 - 11810 (2007/10/02)

The development of a new method for the regiospecific synthesis of polysubstituted indoles and indolines is reported. The key steps involve the generation of zirconocene-stabilized benzyne complexes and subsequent intramolecular olefin insertion reactions to provide tricyclic indoline zirconacycles. The zirconacyclic intermediates were cleaved with iodine to yield diiodo indolines, which were converted to a wide variety of indole and indoline products, such as analogs of tryptamine, serotonin, tryptophan, and the pharmacophore of CC-1065.

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