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91472-18-3

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91472-18-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 91472-18-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,4,7 and 2 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 91472-18:
(7*9)+(6*1)+(5*4)+(4*7)+(3*2)+(2*1)+(1*8)=133
133 % 10 = 3
So 91472-18-3 is a valid CAS Registry Number.

91472-18-3Relevant articles and documents

Phase-Transfer-Catalyzed Synthesis of Oligoethylene Glycols and Derivatives

Bartsch, Richard A.,Cason, Victor C.,Czech, Bronislaw P.

, p. 857 - 860 (2007/10/02)

An efficient, two-step synthetic method for the addition of ethyleneoxy units to diols is reported.Reaction of HOROH with Cl(CH2CH2O)nTHP and 50percent aqueous NaOH in the presence of a phase-transfer catalyst gives THP(OCH2CH2)nORO(CH2CH2O)nTHP from which the protecting groups are readily removed to provide H(OCH2CH2)nORO(CH2CH2O)n in good-to-excellent yields.The influence of reactant diol structure upon yield has been determined.

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