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31717-19-8

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31717-19-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 31717-19-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,7,1 and 7 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 31717-19:
(7*3)+(6*1)+(5*7)+(4*1)+(3*7)+(2*1)+(1*9)=98
98 % 10 = 8
So 31717-19-8 is a valid CAS Registry Number.

31717-19-8Downstream Products

31717-19-8Relevant articles and documents

Synthesis and crystal structure of trifluoromethyl-containing bendamustine hydrochloride

Yin, Yue,Liu, Huailiang,Xiao, Tangxin,Sun, Xiaoqiang,Yang, Ke,Li, Zhengyi

, p. 386 - 391 (2019)

A simple strategy to afford trifluoromethyl-containing bendamustine hydrochloride in 34% overall via nine simple steps including substitution, selective reduction, N-acylation, cyclization, esterification, nitro-reduction, N-dihydroxyethylation, chlorinat

Effect of substituent on regioselectivity and reaction mechanism in aminolysis of 2,4-dinitrophenyl X-substituted benzenesulfonates

Um, Ik-Hwan,Hong, Jin-Young,Seok, Jin-Ah

, p. 1438 - 1444 (2007/10/03)

(Chemical Equation Presented) We report on a kinetic study for the nucleophilic substitution reactions of 2,4-dinitrophenyl X-substituted benzensulfonates (X = 4-MeO, 1a, and X = 4-NO2, 1c) with a series of primary amines in 80 mol % H2O/20 mol % DMSO at 25.0 °C. The reactions proceed through S-O and C-O bond fission pathways competitively. The fraction of the S-O bond fission increases as the attaching amine becomes more basic and the substituent X changes from 4-MeO to 4-NO2, indicating that the regioselectivity is governed by the electronic nature of the substituent X as well as the basicity of amines. The S-O bond fission has been suggested to proceed through an addition intermediate with a change in the rate-determining step (RDS) at pK°a = 8.9 ± 0.1. The electronic nature of the substituent X influences kNS-O and k1 values, but not the k2/k-1 ratios and the pK°a value significantly. Stabilization of the ground state (GS) through resonance interaction between the electron-donating substituent and the electrophilic center has been suggested to be responsible for the decreased reactivity of 1a compared to 1c. The second-order rate constants for the C-O bond fission exhibit no correlation with the electronic nature of the substituent X. The distance effect and the nature of the reaction mechanism have been suggested to be responsible for the absence of the correlation.

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