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3253-69-8

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3253-69-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 3253-69-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,2,5 and 3 respectively; the second part has 2 digits, 6 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 3253-69:
(6*3)+(5*2)+(4*5)+(3*3)+(2*6)+(1*9)=78
78 % 10 = 8
So 3253-69-8 is a valid CAS Registry Number.

3253-69-8Relevant articles and documents

Synthesis of task-specific imidazolium ionic liquid as an efficient catalyst in acetylation of alcohols, phenols, and amines

Chaubey, Snehkrishn A.,Mishra, Roli

, p. 3259 - 3268 (2020/04/17)

Herein, we report the synthesis of task-specific amino-functionalized imidazolium ionic liquid, acetate1-(2-tert-butoxycarbonylamino-ethyl)-3-methyl-3H-imidazol-1-ium; (Boc-NH-EMIM.OAc), as an efficient catalyst for the acetylation of alcohols, phenols, and amines in the presence of acetic anhydride (acetylating reagent). Remarkably, acetic anhydride in the presence of 10?molpercent of catalyst (Boc-NH-EMIM.OAc) under solvent-free conditions showed excellent acetylation activity in shorter duration of time. On the basis of this, a general procedure for acetylation of alcohols, phenols, and amines has been developed. The ionic liquid (Boc-NH-EMIM.OAc) can be readily recovered and reused successfully up to four consecutive cycles without any significant loss of its catalytic activity. We have been able to show that this acetylating method has many advantages. It gives high yields, takes shorter time, and develops the possibility of benign environmental-friendly process.

Protection of COOH and OH groups in acid, base and salt free reactions

Zhu, Xiaotao,Qian, Bo,Wei, Rongbiao,Huang, Jian-Dong,Bao, Hongli

supporting information, p. 1444 - 1447 (2018/04/12)

We report an iron-catalyzed general functional group protection method with inexpensive reagents. This environmentally benign process does not use acids or bases, and does not produce waste products. Further purification beyond filtration and evaporation is, in most cases, unnecessary. Free COOH and OH groups can be protected in a one-pot reaction.

PROCESS AND INTERMEDIATES FOR THE 6,7-ALPHA-EPOXIDATION OF STEROID 4,6-DIENES

-

Page/Page column 69, (2017/12/16)

The invention relates to a process for preparing a compound of general formula (la): wherein R2, Y, R4and R5are as defined herein, wherein the epoxidation is conducted using an oxidant and methyltrioxorhenium as a catalyst (MeReO3). The invention also relates to certain compounds per se.The compounds are intermediates in the synthesis of synthetic bile acids.

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