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1236-33-5

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1236-33-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1236-33-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,2,3 and 6 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 1236-33:
(6*1)+(5*2)+(4*3)+(3*6)+(2*3)+(1*3)=55
55 % 10 = 5
So 1236-33-5 is a valid CAS Registry Number.

1236-33-5Relevant articles and documents

Synthesis of 2,1-benzisoxazoles by nucleophilic substitution of hydrogen in nitroarenes activated by the azole ring

Pokhodylo, Nazariy T.,Teslenko, Yuriy O.,Matiychuk, Vasyl S.,Obushak, Mykola D.

experimental part, p. 2741 - 2748 (2010/02/28)

Reaction of 1-nitro-4-(1,2,3-triazolyl/tetrazolyl)benzenes with arylacetonitriles in an alcoholic medium in the presence of excess alkali gives novel 2,1-benzisoxazoles. These findings indicate a high reactivity of nitroarenes activated by the azole ring due to their electron-deficient character. Moreover, it was found that annulation of the isoxazole ring occurred regioselectively in disubstituted nitroarenes. In the case of 1-(4-nitrophenyl)-1H-tetrazole, the tetrazole ring cleaved faster than the sH-adduct was formed. Georg Thieme Verlag Stuttgart.

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