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21650-57-7

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21650-57-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21650-57-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,6,5 and 0 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 21650-57:
(7*2)+(6*1)+(5*6)+(4*5)+(3*0)+(2*5)+(1*7)=87
87 % 10 = 7
So 21650-57-7 is a valid CAS Registry Number.

21650-57-7Relevant articles and documents

Photoinduced isothermal phase transition of ionic liquid crystals

Zhang, Shiguo,Liu, Shimin,Zhang, Yan,Deng, Youquan

, p. 2004 - 2007 (2012)

Going through a phase: To expand the applications of ionic liquid crystals as on/off switching ionic conductors, photocontrolled supramolecular materials, and ordered/disordered ionic media, photoinduced isothermal smectic-isotropic phase transition of ionic liquid crystals was successfully obtained by incorporation of a small amount of an azobenzene derivative. The presence of the photochromic molecule also maintains the host mesophase and expands the mesogenic temperature range. Copyright

Oxidative dehydrogenation of hydrazines and diarylamines using a polyoxomolybdate-based iron catalyst

Huang, Lei,Qiu, Shiqin,Wei, Yongge,Xie, Jingyan,Yu, Han,Zeng, Xianghua,Zhao, Weizhe

supporting information, p. 7677 - 7680 (2021/08/09)

We report an efficient method for the oxidative dehydrogenation of hydrazines and diarylamines in aqueous ethanol using Anderson-type polyoxomolybdate-based iron(iii) as a catalyst and hydrogen peroxide as an oxidant. A series of azo compounds and tetraarylhydrazines were obtained in moderate to excellent yields. The reaction conditions and substrate scopes are complementary or superior to those of more established protocols. In addition, the catalyst shows good stability and reusability in water. The preliminary mechanistic studies suggest that a radical process is involved in the reaction.

First use of p-tert-butylcalix[4]arene-tetra-O-acetate as a nanoreactor having tunable selectivity towards cross azo-compounds by trapping silver ions

Sarkar, Piyali,Mukhopadhyay, Chhanda

supporting information, p. 442 - 451 (2016/01/30)

p-tert-Butylcalix[4]arene-tetra-O-acetate was established for the first time as a member of the nanoreactor series, even without having any -OH group. The nano range distribution of this nanoreactor was ascertained by DLS, SEM and TEM studies. The capability of this cavitand towards hosting amines in a competitive manner generates a new green pathway for cross coupling of aromatic amines to give the corresponding azo-compounds. In this context, using p-tert-butylcalix[4]arene-tetra-O-acetate as a nanoreactor and silver nitrate as a catalyst, we got the cross azo-compound in good to excellent yields in the eco-friendly solvent water. This green methodology is also applicable for the synthesis of respective homo-compounds.

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