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28991-25-5

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28991-25-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 28991-25-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,9,9 and 1 respectively; the second part has 2 digits, 2 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 28991-25:
(7*2)+(6*8)+(5*9)+(4*9)+(3*1)+(2*2)+(1*5)=155
155 % 10 = 5
So 28991-25-5 is a valid CAS Registry Number.

28991-25-5Downstream Products

28991-25-5Relevant articles and documents

Stereoselective synthesis of 2,3-disubstituted dihydrobenzofuran using alkyne Prins type cyclization to vinylogous carbonates

Gharpure, Santosh J,Prasath

, p. 943 - 949 (2011)

An intramolecular, alkyne Prins type cyclization of vinylogous carbonates derived from o-alkynyl phenols is developed for the stereoselective construction of trans-2,3-disubstituted dihydrobenzofuran derivatives. Strong Lewis acids like TMSOTf catalyse th

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