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143823-74-9

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143823-74-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 143823-74-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,3,8,2 and 3 respectively; the second part has 2 digits, 7 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 143823-74:
(8*1)+(7*4)+(6*3)+(5*8)+(4*2)+(3*3)+(2*7)+(1*4)=129
129 % 10 = 9
So 143823-74-9 is a valid CAS Registry Number.

143823-74-9Relevant articles and documents

A FACILE SYNTHESIS OF 9-NOR-9-HYDROXYHEXAHYDROCANNABINOL VIA INTRAMOLECULAR REVERSE ELECTRON DEMAND DIELS-ALDER CYCLIZATION

Lu, Zhan Guo,Inoue, Seiichi

, p. 1107 - 1117 (2007/10/02)

A simple and efficient new synthesis of 9-nor-9-hydroxyhexahydrocannabinol is achieved, through the intramolecular cycloaddition of an o-quinonemethide which is generated from 2-(1-hydroxy-3-methoxymethoxy-7-methyl-6-octenyl)-1,3-bis(O-methoxymethyl)olivetol (12b), which in turn is prepared by reaction of the lithiated olivetol bis(methoxymethyl)ether with 3-methoxymethoxy-7-methyl-6-octenal (9).

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