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1644630-67-0

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1644630-67-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1644630-67-0 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,6,4,4,6,3 and 0 respectively; the second part has 2 digits, 6 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 1644630-67:
(9*1)+(8*6)+(7*4)+(6*4)+(5*6)+(4*3)+(3*0)+(2*6)+(1*7)=170
170 % 10 = 0
So 1644630-67-0 is a valid CAS Registry Number.

1644630-67-0Relevant articles and documents

Kinetic study on aminolysis of 4-chloro-2-nitrophenyl X-substituted-benzoates in Acetonitrile and in 80 mol % H2O/20 mol % DMSO: Effect of medium on reactivity and reaction mechanism

Kim, Ha-Ram,Um, Tae-Il,Kim, Min-Young,Um, Ik-Hwan

, p. 1128 - 1132 (2014/05/06)

A kinetic study on aminolysis of 4-chloro-2-nitrophenyl X-substituted-benzoates (6a-i) in MeCN is reported. The Hammett plot for the reactions of 6a-i with piperidine consists of two intersecting straight lines, while the Yukawa-Tsuno plot exhibits an exc

The α-effect in hydrazinolysis of 4-chloro-2-nitrophenyl x-substituted-benzoates: Effect of substituent x on reaction mechanism and the α-effect

Kim, Min-Young,Kim, Tae-Eun,Lee, Jieun,Um, Ik-Hwan

, p. 2271 - 2276 (2014/09/29)

Second-order rate constants (kN) have been measured spectrophotometrically for the reaction of 4-chloro-2- nitrophenyl X-substituted-benzoates (6a-6h) with a series of primary amines including hydrazine in 80 mol % H2O/20 mol % DMSO at 25.0°C. The Bronsted-type plot for the reaction of 4-chloro-2-nitrophenyl benzoate (6d) is linear with βnuc = 0.74 when hydrazine is excluded from the correlation. Such a linear Bronsted-type plot is typical for reactions reported previously to proceed through a stepwise mechanism in which expulsion of the leaving group occurs in the rate-determining step (RDS). The Hammett plots for the reactions of 6a-6h with hydrazine and glycylglycine are nonlinear. In contrast, the Yukawa-Tsuno plots exhibit excellent linear correlations with ?X = 1.29-1.45 and r = 0.53-0.56, indicating that the nonlinear Hammett plots are not due to a change in RDS but are caused by resonance stabilization of the substrates possessing an electron-donating group (EDG). Hydrazine is ca. 47-93 times more reactive than similarly basic glycylglycine toward 6a-6h (e.g., the α-effect). The α-effect increases as the substituent X in the benzoyl moiety becomes a stronger electronwithdrawing group (EWG), indicating that destabilization of the ground state (GS) of hydrazine through the repulsion between the nonbonding electron pairs on the two N atoms is not solely responsible for the substituent-dependent α-effect. Stabilization of transition state (TS) through five-membered cyclic TSs, which would increase the electrophilicity of the reaction center or the nucleofugality of the leaving group, contributes to the α-effect observed in this study.

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