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137601-57-1

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137601-57-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 137601-57-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,6,0 and 1 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 137601-57:
(8*1)+(7*3)+(6*7)+(5*6)+(4*0)+(3*1)+(2*5)+(1*7)=121
121 % 10 = 1
So 137601-57-1 is a valid CAS Registry Number.

137601-57-1Downstream Products

137601-57-1Relevant articles and documents

Transition state structure and frontier orbital influence on the cycloaddition reactions of 2,5-dimethyl-3,4-dimethylenethiophene with styrenes and benzaldehydes

Haider,Clites,Berson

, p. 5305 - 5308 (2007/10/02)

The biradical 2,5-dimethyl-3,4-dimethylenethiophene reacts with styrenes and benzaldehydes to give fused cycloadducts. The effect of substituents on the efficiency of the benzaldehyde trapping reaction resembles that of normal electron-demand Diels-Adler reactions and is linear with the Hammett σ-constant. With the styrenes, the Hammett plot is non-linear. Frontier orbital theory provides a rationalization of these effects in terms of the uniquely small HOMO-LUMO gap characteristic of biradicals.

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