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304481-88-7

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304481-88-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 304481-88-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,0,4,4,8 and 1 respectively; the second part has 2 digits, 8 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 304481-88:
(8*3)+(7*0)+(6*4)+(5*4)+(4*8)+(3*1)+(2*8)+(1*8)=127
127 % 10 = 7
So 304481-88-7 is a valid CAS Registry Number.

304481-88-7Downstream Products

304481-88-7Relevant articles and documents

Synthesis of thiophene derivatives on soluble polymer-support using Gewald reaction

Zhang, Haiqing,Yang, Guichun,Chen, Jianian,Chen, Zuxing

, p. 3055 - 3059 (2004)

A variety of thiophene derivatives have been synthesized using poly(ethylene glycol) (PEG) as soluble polymer support. PEG reacted with cyanoacetic acid, DCC and DMAP in CHCl3 under microwave irradiation to give PEG-bound cyanoacetic ester 1. A mixture of 1, elemental sulfur, DIPEA and 2 carried out Gewald reaction under microwave irradiation to afford 3, which was acylated and treated with 1% KCN in methanol to give thiophene derivatives 6. This synthetic method is simple and mild, and the yields are moderate to high.

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