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215807-84-4

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215807-84-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 215807-84-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,5,8,0 and 7 respectively; the second part has 2 digits, 8 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 215807-84:
(8*2)+(7*1)+(6*5)+(5*8)+(4*0)+(3*7)+(2*8)+(1*4)=134
134 % 10 = 4
So 215807-84-4 is a valid CAS Registry Number.

215807-84-4Relevant articles and documents

Highly enantiopure (tert-butyldiphenylsilyloxymethyl)oxiranes from barium carbonate

Ekhato, I. Victor,Palazzolo, Mark

, p. 3727 - 3741 (1998)

The synthesis of (2R)-(tert-butyldiphenylsilyloxymethyl)oxirane and the (2S)-enantiomer from barium carbonate was developed. Methyl glycolate or the hydroxamate analog was prepared and in turn reacted with (S)-(-)-methyl p- tolylsulfoxide or the (R)-enantiomer to make β-keto sulfoxides. From the sulfoxides, we made the diastereoisomeric alcohols in a highly selective sulfoxide group directed hydride reduction, and a Pummerer rearrangement reaction followed by deprotection yielded the enantiomeric diols. (2R)- (tert-Butyldiphenylsilyloxymethyl)oxirane and its (2S)-enantiomer were derived from these diols in an overall yield of 56 % from barium carbonate. This method was developed to provide a convenient access to isotope-labeled analogs of these compounds.

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