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75503-88-7

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75503-88-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 75503-88-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,5,5,0 and 3 respectively; the second part has 2 digits, 8 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 75503-88:
(7*7)+(6*5)+(5*5)+(4*0)+(3*3)+(2*8)+(1*8)=137
137 % 10 = 7
So 75503-88-7 is a valid CAS Registry Number.

75503-88-7Relevant 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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