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35781-33-0

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35781-33-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 35781-33-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,5,7,8 and 1 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 35781-33:
(7*3)+(6*5)+(5*7)+(4*8)+(3*1)+(2*3)+(1*3)=130
130 % 10 = 0
So 35781-33-0 is a valid CAS Registry Number.

35781-33-0Downstream Products

35781-33-0Relevant articles and documents

Selective Reductions of 3-Substituted Hydantoins to 4-Hydroxy-2-imidazolidinones and Vicinal Diamines

Cortes, Sergio,Kohn, Harold

, p. 2246 - 2254 (2007/10/02)

N3-Substituted hydantoins (1) have been shown to undergo LiAlH4 reduction (THF, room temperature, 2 days) to give 4-hydroxy-2-imidazolidinones (3) in good yields.Reduction of 3,5-disubstituted hydantoins in which an aliphatic substituent was present at nitrogen 3 led to the preferential formation of the cis adduct 3.Conversely, disubstituted hydantoins possessing an aryl moiety at nitrogen 3 gave the trans derivative 3 as the major product.Treatment of the N3-substituted hydantoins (1) under more vigorous conditions (THF, reflux, 3 days) led to selective ring opening of 1 to yield N-methylethylenediamines (7).The scope of both of these reductive processes has been explored, and explanations are offered to account for the observed results.Full spectral (infrared, 1H and 13C NMR, and mass spectra) data on all three classes of compounds (1, 3, and 7) have been collected.Together this information provides a consistent data set which is useful in structure elucidation.Moreover, various NMR aids have been discerned for the isomeric cis- and trans-4-hydroxy-2-imidazolidinones (3) which permitted stereochemical assignments for these compounds.

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