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184536-70-7

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184536-70-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 184536-70-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,4,5,3 and 6 respectively; the second part has 2 digits, 7 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 184536-70:
(8*1)+(7*8)+(6*4)+(5*5)+(4*3)+(3*6)+(2*7)+(1*0)=157
157 % 10 = 7
So 184536-70-7 is a valid CAS Registry Number.

184536-70-7Upstream product

184536-70-7Downstream Products

184536-70-7Relevant articles and documents

Dihydropyridines in organometallic synthesis. Formation of pyridine and dihydropyridine-stabilized alkylidene complexes of tungsten(0) and chromium(0) from Fischer carbene complexes: Structure and reactivity

Rudler, Henri,Audouin, Max,Parlier, Andrée,Martin-Vaca, Blanca,Goumont, Régis,Durand-Réville, Thomas,Vaissermann, Jacqueline

, p. 12045 - 12058 (2007/10/03)

1,2- and 1,4-dihydropyridines react with alkoxycarbene complexes of chromium and tungsten to give, upon an unprecedented hydride transfer, alcohol elimination, and pyridine fixation on the carbene carbon, a new class of air-stable pyridinium ylide complexes. These pyridine-protected alkylidene complexes of chromium(0) and tungsten(0) were fully characterized by X-ray crystallography. In the case of (CO)5W=C(CH3)(OEt) (5a), besides the pyridinium ylide complex (CO)5W--C(H)(CH3)(pyridine)+ (7a), the dihydropyridinium complex (CO)5W-C(H)(CH3)(2,5-dihydropyridine)+ (8a) was also isolated. The intermediate tungstate (CO)5W--C(H)(CH3)(OEt)(CH3NC5H5)+ could be easily obtained and characterized by using, as reducing agent, N-methyldihydropyridine. Whereas phenyl-substituted pyridinium complexes easily transferred the benzylidene moiety to alkenes, alkyl-substituted complexes appeared more reluctant to such a transfer: satisfactory results were observed in the case of nucleophilic olefins such as enol ethers. However, straightforward transfer of the tungsten(0) alkylidene group took place, even at room temperature, in the case of alkoxycarbene complexes tethered to alkenes, giving access, upon intramolecular cyclopropanation reactions, to polycyclic systems.

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