Cas 5238-40-4,Acetic acid 1-butenyl ester

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Check Digit Verification of cas no

The CAS Registry Mumber 5238-40-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,2,3 and 8 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 5238-40:
(6*5)+(5*2)+(4*3)+(3*8)+(2*4)+(1*0)=84
84 % 10 = 4
So 5238-40-4 is a valid CAS Registry Number.

5238-40-4Upstream product

5238-40-4Downstream Products

30989-69-6 2-(diethoxymethyl)-1,1-diethoxybutane

5238-40-4Relevant articles and documents

A Short and Stereoselective Synthesis of the Carbapenem Antibiotic PS-5

Kametani, Tetsuji,Honda, Toshio,Nakayama, Atsushi,Sasakai, Yuko,Mochizuki, Tomoko,Fukumoto, Keiichiro

, p. 2228 - 2232 (2007/10/02)

The benzyl ester (3) and p-nitrobenzyl ester (PNB ester) (4) of the antibiotic PS-5 and the bis-protected PS-6 (5) were stereoselectively synthesised by application of the new carbon-carbon bond formation reaction at the C-4-position of 4-acetoxy-3-ethyl-

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5238-40-4