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859322-94-4

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859322-94-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 859322-94-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,5,9,3,2 and 2 respectively; the second part has 2 digits, 9 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 859322-94:
(8*8)+(7*5)+(6*9)+(5*3)+(4*2)+(3*2)+(2*9)+(1*4)=204
204 % 10 = 4
So 859322-94-4 is a valid CAS Registry Number.

859322-94-4Upstream product

859322-94-4Downstream Products

859322-94-4Relevant articles and documents

A new approach to silicon rhodamines by Suzuki–Miyaura coupling – scope and limitations

Kanagasundaram, Thines,Timmermann, Antje,Kramer, Carsten S.,Kopka, Klaus

, p. 2569 - 2576 (2019)

Background: Silicon rhodamines are of particular interest because of their advantageous dye properties (fluorescence- and biostability, quantum efficiency, tolerance to photobleaching). Therefore, silicon rhodamines find frequent application in STED (stimulated emission depletion) microscopy, as sensor molecules for, e.g., ions and as fluorophores for the optical imaging of tumors. Different strategies were already employed for their synthesis. Because of just three known literature examples in which Suzuki–Miyaura cross couplings gave access to silicon rhodamines in poor to moderate yields, we wanted to improve these first valuable experimental results. Results: The preparation of the xanthene triflate was enhanced and several boron sources were screened to find the optimal coupling partner. After optimization of the palladium catalyst, different substituted boroxines were assessed to explore the scope of the Pd-catalyzed cross-coupling reaction. Conclusions: A number of silicon rhodamines were synthesized under the optimized conditions in up to 91% yield without the necessity of HPLC purification. Moreover, silicon rhodamines functionalized with free acid moieties are directly accessible in contrast to previously described methods.

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