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204444-15-5

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204444-15-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 204444-15-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,4,4,4 and 4 respectively; the second part has 2 digits, 1 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 204444-15:
(8*2)+(7*0)+(6*4)+(5*4)+(4*4)+(3*4)+(2*1)+(1*5)=95
95 % 10 = 5
So 204444-15-5 is a valid CAS Registry Number.

204444-15-5Upstream product

204444-15-5Relevant articles and documents

CeCl3/Sm promoted pinacolic coupling of aromatic aldehydes and ketones

Li, Xue,Zhang, Songlin,Zhang, Xinying,Wang, Xiao Yang

, p. 1043 - 1045 (2003)

The pinacolic coupling of aromatic aldehydes and ketone was performed with cerium trichloride and samarium in THF at room temperature to afford the corresponding 1,2-diols in good yields.

Bifunctional copper-based photocatalyst for reductive pinacol-type couplings

Caron, Antoine,Morin, émilie,Collins, Shawn K.

, p. 9458 - 9464 (2019/10/11)

A bifunctional copper-based photocatalyst has been prepared that employs a pyrazole-pyridine ligand incorporating a sulfonamide moiety that functions as an intramolecular hydrogen-bond donor for a photochemical PCET process. In typical reductive PCET processes, the photocatalyst and H-bond donor must have an appropriate redox potential and pKa, respectively, to promote the PCET. When working in concert in a bifunctional catalyst such as Cu(pypzs)(BINAP)BF4, the pKa of the H-bond donor can have an acidity that is orders of magnitude less and still efficiently promote the PCET process. A reductive pinacol-type coupling can be performed using a base-metal derived photocatalyst to afford valuable diols (24 examples, 46-99% yield), from readily available aldehydes and ketones.

Pinacol coupling reaction of aromatic aldehydes mediated by aqueous vanadium(II) solution under ultrasound irradiation

Wang, Shu-Xiang,Wang, Ke,Li, Ji-Tai

, p. 2387 - 2394 (2007/10/03)

Pinacol coupling of aromatic aldehydes by aqueous vanadium(II) solution under ultrasound irradiation at room temperature can lead to the corresponding pinacols in 54-93% yields within 15-30 min. Copyright Taylor & Francis, Inc.

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