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118993-93-4

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118993-93-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 118993-93-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,8,9,9 and 3 respectively; the second part has 2 digits, 9 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 118993-93:
(8*1)+(7*1)+(6*8)+(5*9)+(4*9)+(3*3)+(2*9)+(1*3)=174
174 % 10 = 4
So 118993-93-4 is a valid CAS Registry Number.

118993-93-4Relevant articles and documents

Intermolecular metal-free cyclopropanation of alkenes using tosylhydrazones

Barluenga, Jose,Quinones, Noelia,Tomas-Gamasa, Maria,Cabal, Maria-Paz

supporting information; experimental part, p. 2312 - 2317 (2012/06/01)

We describe the first general method for the metal-free cyclopropanation of alkenes by using N-tosylhydrazones as an in situ source of diazo compounds. This new method works with a wide variety of alkenes (styrene derivatives, dienes, enynes, and electron-deficient alkenes) by using N-tosylhydrazones derived from various ketones or aldehydes (aromatic, aliphatic, enones). The reaction is performed with the use of K2CO3 as a base to form the diazo species and is compatible with a wide array of functional groups. A new procedure for the synthesis of cyclopropanes by the formal cyclopropanation of carbonyl compounds and alkenes is described. This metal-free reaction proceeds through the base-promoted decomposition of tosylhydrazones. There is significant tolerance of the functional groups, enabling cyclopropanation in the presence of functionalities often not compatible with other methodologies.

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