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118798-06-4

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118798-06-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 118798-06-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,8,7,9 and 8 respectively; the second part has 2 digits, 0 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 118798-06:
(8*1)+(7*1)+(6*8)+(5*7)+(4*9)+(3*8)+(2*0)+(1*6)=164
164 % 10 = 4
So 118798-06-4 is a valid CAS Registry Number.

118798-06-4Relevant articles and documents

Intramolecular Michael-Aldol Condensation Approach to the Construction of Advanced Intermediates in the Synthesis of Forskolin

Somoza, Carmen,Darias, Jose,Ruveda, Edmundo A.

, p. 1539 - 1543 (1989)

The tricyclic α,β-unsaturated ketone 6 has been elaborated from the β-keto ester 7c by using an intramolecular Michael addition (7c 10), in tandem with an intramolecular aldol condensation (10 6).Starting from 6, the allylic alcohols 17a and 17b were prepared.The stereochemical features of 17a and 17b were determined by analysis of their NMR spectra and further confirmed by transformation of 17b into the known methyl ether 17c.Through a simple synthetic sequence, 17b was, in turn, converted to the known acetonide 19c.Compounds 17b and 19c are significant intermediates for the synthesis of forskolin (1).

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