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13546-92-4

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13546-92-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 13546-92-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,3,5,4 and 6 respectively; the second part has 2 digits, 9 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 13546-92:
(7*1)+(6*3)+(5*5)+(4*4)+(3*6)+(2*9)+(1*2)=104
104 % 10 = 4
So 13546-92-4 is a valid CAS Registry Number.

13546-92-4Relevant articles and documents

TEMPERATURE AND SOLVENT EFFECTS IN WITTIG REACTIONS

Aksnes, Gunnar,Berg, Terje Jonny,Gramstad, Thor

, p. 79 - 84 (2007/10/03)

The rates of the Wittig reactions between 4-nitrobenzaldehyde and five stabilized phosphoranes, Ph3P=CHC(O)R, where R = OMe, OPh, NPh2, Me, and Ph, are studied in benzene, dimethylformamide (DMF), and methanol, at 25, 35, and 45 deg C.The activation energies, E, when plotted as function of the corresponding activation entropies, ΔS(excit.), are found in two different regions in the E - ΔS(excit.) diagram, approximately described by two parallel lines, one belonging to the reactions in benzene and DMF, the other to the reactions in methanol.The differences in the activation parameters in aprotic and protic solvents are most likely a consequence of strong H-bonding in protic solvents.Reaction mechanisms in aprotic and protic solvents are discussed. - Key words: Stabilized phosphoranes; 4-nitrobenzaldehyde; Wittig reaction; temperature and solvent effects

AMINO- OR GUANIDINO-PHENYLPROPIONIC ACID DERIVATIVES

-

, (2008/06/13)

Amino-or guanidino-phenylpropionic ester derivatives represented by the formula: STR1 wherein R is--NH 2 or STR2 R 1 is hydrogen or a lower alkyl group, and R 2 is an unsubstituted or a lower-alkyl-, carboxyalkyl-, lower-alkoxy-, lower-alkoxycarbonyl-or h

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