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20859-19-2

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20859-19-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20859-19-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,8,5 and 9 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 20859-19:
(7*2)+(6*0)+(5*8)+(4*5)+(3*9)+(2*1)+(1*9)=112
112 % 10 = 2
So 20859-19-2 is a valid CAS Registry Number.

20859-19-2Relevant articles and documents

Palladium-catalyzed asymmetric hydrogenation of 2-aryl cyclic ketones for the synthesis oftranscycloalkanols through dynamic kinetic resolution under acidic conditions

Li, Xiang,Zhao, Zi-Biao,Chen, Mu-Wang,Wu, Bo,Wang, Han,Yu, Chang-Bin,Zhou, Yong-Gui

supporting information, p. 5815 - 5818 (2020/06/03)

The first efficient palladium-catalyzed asymmetric hydrogenation of 2-aryl cyclic ketones has been described through dynamic kinetic resolution under acidic conditions, providing a facile access to chiraltranscycloalkanol derivatives with excellent enantioselectivities.

α-iodocycloalkenones: Synthesis of (±)-epibatidine

Sirisoma, Nilantha S.,Johnson, Carl R.

, p. 2059 - 2062 (2007/10/03)

A synthesis of the non-opiate analgesic alkaloid epibatidine was achieved in 13 steps and 13% Overall yield starting from 1,3-cyclohexadiene using in a key step a modified Stille coupling reaction on an α- iodocyclohexenone.

Asymmetric synthesis of CDP840 by Jacobsen epoxidation. An unusual syn selective reduction of an epoxide

Lynch,Choi,Churchill,Volante,Reamer,Ball

, p. 9223 - 9228 (2007/10/03)

An asymmetric synthesis of the PDE IV inhibitor, CDP840 (3) is reported. The absolute stereochemistry was controlled by a Jacobsen epoxidation of the Z triaryl olefin 8 (89% ee) or the E triaryl olefin 9 (48% ee). The disparate results in stereocontrol were interpreted in terms of the 'skewed side-on approach model' proposed by Jacobsen. LiBH4 · BH3 reduction of the epoxides was found to proceed with retention of configuration.

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