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684283-54-3

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684283-54-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 684283-54-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,8,4,2,8 and 3 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 684283-54:
(8*6)+(7*8)+(6*4)+(5*2)+(4*8)+(3*3)+(2*5)+(1*4)=193
193 % 10 = 3
So 684283-54-3 is a valid CAS Registry Number.

684283-54-3Relevant articles and documents

Stable Singlet Carbenes as Organic Superbases

Bertrand, Guy,Grotjahn, Douglas B.,Jazzar, Rodolphe,Junor, Glen P.,Vermersch, Fran?ois,Yazdani, Sima

supporting information, p. 27253 - 27257 (2021/11/22)

A simple experimental procedure for scaling carbene Br?nsted basicity is described. The results highlight the strong basicity of pyrazol-4-ylidenes, a type of mesoionic carbene, also named cyclic-bentallenes (CBA). They are more basic (pKaH >42.7 in acetonitrile) than the popular proazaphosphatrane Verkade bases, and even the Schwesinger phosphazene superbase P4(tBu). The basicity of these compounds can readily be tuned, and they are accessible in multigram quantities. These results open new avenues for carbon centered superbases.

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