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37850-39-8

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37850-39-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 37850-39-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,7,8,5 and 0 respectively; the second part has 2 digits, 3 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 37850-39:
(7*3)+(6*7)+(5*8)+(4*5)+(3*0)+(2*3)+(1*9)=138
138 % 10 = 8
So 37850-39-8 is a valid CAS Registry Number.

37850-39-8Relevant articles and documents

Synthetic Studies on Terpene Compounds. Part 13. Total Synthesis of Fraxinellone

Tokoroyama, Takashi,Fukuyama, Yoshiyasu,Kubota, Takashi,Yokotani, Kenji

, p. 1557 - 1562 (2007/10/02)

The total synthesis of fraxinellone (1), the simplest example of degraded limonoid, via the 6-formyl-2,6-dimethylcyclohex-2-enecarboxylates (2) is described.In the initial approach the C-6 methylation of ethyl 6-formyl-2-methylcyclohex-2-enecarboxylate (7) was carried out by cyclopropanation and ring cleavage which unexpectedly gave the bicycloheptane compound (20), with a poor yield of the desired product.Subsequently, the key intermediate (2) was synthesized effectively by the Diels-Alder reaction between ethyl 3-methylpenta-2,4-dienoate and methacrolein.The reaction of the aldehyde ester (2) with furyl-lithium followed by double-bond isomerization with base afforded (+/-)-fraxinellone, together with the corresponding diastereoisomer.

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