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118917-14-9

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118917-14-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 118917-14-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,8,9,1 and 7 respectively; the second part has 2 digits, 1 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 118917-14:
(8*1)+(7*1)+(6*8)+(5*9)+(4*1)+(3*7)+(2*1)+(1*4)=139
139 % 10 = 9
So 118917-14-9 is a valid CAS Registry Number.

118917-14-9Relevant academic research and scientific papers

Novel Two-Step Synthesis of Homobarrelenones, Bicyclonona-3,6,8-trien-2-ones, from Tropones and 2,3-Bis(methoxycarbonyl)-7-oxabicyclohepta-diene by High-Pressure Cycloaddition-Thermal Cyclorevision Procedure

Tian, Guan Rong,Sugiyama, Shigeru,Mori, Akira,Takeshita, Hitoshi

, p. 1557 - 1560 (1987)

The Diels-Alder adduct of tropone with 2,3-bis(methoxycarbonyl)-7-oxabicyclohepta-2,5-diene formed homobarrelenone by heating at ca. 130 deg C.Similarly prepared were 1-hydroxy-, 3-methoxy-, 1-chloro-, and 3-chlorohomobarrelenones.High-pressure cycloaddition improved the yields of the Diels-Alder adducts.

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