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25558-12-7

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25558-12-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 25558-12-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,5,5,5 and 8 respectively; the second part has 2 digits, 1 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 25558-12:
(7*2)+(6*5)+(5*5)+(4*5)+(3*8)+(2*1)+(1*2)=117
117 % 10 = 7
So 25558-12-7 is a valid CAS Registry Number.

25558-12-7Relevant articles and documents

Use of Hypervalent Iodine in the Synthesis of Isomeric Dihydrooxazoles

Carlucci, Claudia,Tota, Arianna,Colella, Marco,Ronamazzi, Giuseppe,Clarkson, Guy J.,Luisi, Renzo,Degennaro, Leonardo

, p. 428 - 436 (2018/06/11)

[Figure not available: see fulltext.] A convenient synthesis of 2- and/or 3-oxazolines has been developed depending on the structure and stereochemistry of the starting amino alcohol. PhI(OAc)2 acted as oxidant on the intermediate imine, as sup

SYNTHETIC APPLICATIONS OF CHROMIUM(VI) REAGENTS IN COMBINATION WITH CHLOROTRIMETHYLSILANE

Cossio, Fernando P.,Aizpurua, Jesus M.,Palomo, Claudio

, p. 225 - 231 (2007/10/02)

The synthetic utility of chromium(VI) reagents together with chlorotrimethylsilane, as new oxidizing systems, is described.Pyridinium dichromate (PDC) in combination with chlorotrimethylsilane oxidizes tert-butyldimethylsilyl ethers in good to excellent yields.Trimethylsilyl chlorochromate, a new chromium(VI) reagent, also was found efficient for this oxidative-deprotection method.These reagents were applied to the oxidation of some N-(2-phenyl-2-hydroxyethyl)azetidin-2-ones as well as N-(2-phenyl-2-trialkylsiloxy)azetidin-2-ones into their corresponding carbonyl compounds, key intermediates for N-unsubstituted β-lactams.Oxidation of hydroquinones and protected trialkylsilyl hydroquinones was also described.Protection of hydroquinones by means of the tert-butyldimethylsilyl group was achieved by using the readily available tert-butyldimethylchlorosilane (TBDMCS) and 1,8-diazabicycloundec-7-ene (DBU) as base, which avoids the use of sophisticated and (or) sensitive reagents.

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