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25070-80-8

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25070-80-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 25070-80-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,5,0,7 and 0 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 25070-80:
(7*2)+(6*5)+(5*0)+(4*7)+(3*0)+(2*8)+(1*0)=88
88 % 10 = 8
So 25070-80-8 is a valid CAS Registry Number.

25070-80-8Relevant articles and documents

De novo synthesis of troc-protected amines: Intermolecular rhodium-catalyzed C-H amination with N-tosyloxycarbamates

Lebel, Helene,Kim, Huard

, p. 639 - 642 (2007)

The rhodium-catalyzed intermolecular C-H insertion of the nitrene derived from 2,2,2-trichloroethyl-N-tosyloxycarbamate proceeded in good to excellent yields to produce a variety of Troc-protected amines. With cyclic aliphatic alkanes, it is possible to use only 2 equiv of substrate, whereas the reaction with aromatic alkanes is run neat. Not only does the nitrene insertion proceed in benzylic, secondary, and tertiary C-H bonds but also primary C-H insertion products were obtained in good yields. Finally, the use of chiral rhodium catalysts to provide an enantioselective version of this process is discussed.

N-methylimidazole-catalyzed synthesis of carbamates from hydroxamic acids via the lossen rearrangement

Yoganathan, Sabesan,Miller, Scott J.

, p. 602 - 605 (2013/04/11)

An efficient, one-pot, N-methylimidazole (NMI) accelerated synthesis of aromatic and aliphatic carbamates via the Lossen rearrangement is reported. NMI is a catalyst for the conversion of isocyanate intermediates to the carbamates. Moreover, the utility of arylsulfonyl chloride in combination with NMI minimizes the formation of often-observed hydroxamate-isocyanate dimers during the sequence. Under the present conditions, lowering of temperatures is also possible, enabling a mild protocol.

Unmodified nano-powder magnetite catalyzes a four-component aza-Sakurai reaction

Martinez, Ricardo,Ramon, Diego J.,Yus, Miguel

supporting information; experimental part, p. 1235 - 1240 (2009/05/30)

A new catalyst for an old material: magnetite is an excellent Lewis acid catalyst for the four-component aza-Sakurai reaction. The process could be repeated up to 15-times without losing effectiveness, with the catalyst recycling being as easy as the use of a simple magnet. The catalyst is selective and could discriminate between aldehyde and ketone functionalities, catalyzing first the reaction with the higher electrophilic aldehyde.

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