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156237-51-3

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156237-51-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 156237-51-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,6,2,3 and 7 respectively; the second part has 2 digits, 5 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 156237-51:
(8*1)+(7*5)+(6*6)+(5*2)+(4*3)+(3*7)+(2*5)+(1*1)=133
133 % 10 = 3
So 156237-51-3 is a valid CAS Registry Number.

156237-51-3Downstream Products

156237-51-3Relevant articles and documents

Functionalized (Benzotriazol-1-yl)methanes as 1,1-Dipole Synthon Equivalents in Diverse Annulations to Aromatic and Heteroaromatic Rings

Katritzky, Alan R.,Wang, Xiaojing,Xie, Linghong,Toader, Dorin

, p. 3445 - 3449 (1998)

The title compounds 1a-e readily undergo deprotonation and subsequent reactions with the appropriate electrophiles to form intermediates of types 4 and 7 which, upon treatment with Lewis acids, cyclize to afford fused aromatics 5 and 8. Tetrahydronaphthalene 11a, 1,2,3,4-tetrahydrochromanes (11b-d, 13), indanes (16, 18), 9,10-dihydrophenanthrenes (21a-c, 25), and tetrahydro[1,2-α]indoles (28, 30) with phenyl, substituted phenyl, and thienyl substituents were prepared in this manner.

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