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90925-42-1

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90925-42-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 90925-42-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,9,2 and 5 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 90925-42:
(7*9)+(6*0)+(5*9)+(4*2)+(3*5)+(2*4)+(1*2)=141
141 % 10 = 1
So 90925-42-1 is a valid CAS Registry Number.

90925-42-1Relevant articles and documents

Synthesis of (±)-14-epi-hydroxydolasta-1(15),7,9-triene and (±)-7-epi -acetoxy-14-epi-hydroxydolasta-1(15),8-diene

Majetich, George,Yu, Jianhua

, p. 75 - 84 (2012/03/07)

1,3-Dimethyl-2-nitrobenzene was converted to the key intramolecular Friedel-Crafts intermediate 24 in ten steps. Treatment of 24 with TiCl 4 produced tricyclic enone 25 in 61%-75% yield, having the requisite trans relationship of the two angular methyl groups and many of the salient features of the dolastane diterpenes. The structure of enone 25 was verified by X-ray crystallography analysis. Cyclization product 25 permitted the facile synthesis of (±)-14-epi-hydroxydolasta-1(15),7,9-triene and (±)-7-epi-acetoxy-14-epi-hydroxydolasta-1(15),8-diene, which are detailed in this article.

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