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218903-31-2

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218903-31-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 218903-31-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,8,9,0 and 3 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 218903-31:
(8*2)+(7*1)+(6*8)+(5*9)+(4*0)+(3*3)+(2*3)+(1*1)=132
132 % 10 = 2
So 218903-31-2 is a valid CAS Registry Number.

218903-31-2Relevant articles and documents

Synthesis and Photoswitching Properties of Bioinspired Dissymmetric I-Pyrone, an Analogue of Cyclocurcumin

Pecourneau, Jérémy,Losantos, Raúl,Monari, Antonio,Parant, Stéphane,Pasc, Andreea,Mourer, Maxime

, p. 8112 - 8126 (2021/06/30)

Cyclocurcumin (CC), a turmeric curcuminoid with potential therapeutic properties, is also a natural photoswitch that may undergo E/Z photoisomerization under UV light. To be further exploited in relevant biological applications, photoactivation under near-infrared (NIR) irradiation is required. Such requirement can be met through opportune chemical modifications, by favoring two-photon absorption (TPA) probability. Herein, a general and efficient synthesis of a biomimetic 2,6-disubstituted-δ-pyrone analogue of CC is described, motivated by the fact that molecular modeling previews an order of magnitude increase of its NIR TPA compared to CC. Three retrosynthetic pathways have been identified (i) via an aryl-oxazole intermediate or via aryl-diynone through (ii) a bottom-up or (iii) a top-down approach. While avoiding the passage through unstable synthons or low-yield intermediate reactions, only the latest approach could conveniently afford the 2,6-disubstituted-I-pyrone analogue of CC, in ten steps and with an overall yield of 18%. The photophysical properties of our biomimetic analogue have also been characterized showing an improved photoisomerization yield over the parent natural compound. The potentially improved nonlinear optical properties, as well as enhanced stability, may be correlated to the enforcement of the planarity of the pyrone moiety leading to a quadrupolar D-π-A-π-D system.

Total synthesis of moniliformediquinone and calanquinone A as potent inhibitors for breast cancer

Thangaraj, Shankar,Tsao, Wen-Shing,Luo, Yi-Wei,Lee, Yean-Jang,Chang, Chia-Fu,Lin, Chun-Cheng,Uang, Biing-Jiun,Yu, Chia-Chun,Guh, Jih-Hwa,Teng, Che-Ming

experimental part, p. 6166 - 6172 (2011/09/19)

The first synthesis of moniliformediquinone has been achieved in which the longest linear sequence is only nine steps. The synthesis proceeds in 23% overall yield from commercially available 2,4,5-trimethoxybenzaldehyde. The key transformations include a

Synthesis of symmetrical bis-alkynyl or alkyl pyridine and thiophene derivatives and their antiangiogenic activities

Ahn, Chan Mug,Shin, Woon-Seob,Woo, Ho Bum,Lee, Seokjoon,Lee, Hyean-Woo

, p. 3893 - 3896 (2007/10/03)

Fourteen symmetrical bis-alkynyl pyridine and thiophene derivatives were synthesized and their antiangiogenic activity was evaluated with the proliferation and tube formation inhibitory activity on the human umbilical vein endothelial cells (HUVEC). Compo

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