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874635-67-3

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874635-67-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 874635-67-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,7,4,6,3 and 5 respectively; the second part has 2 digits, 6 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 874635-67:
(8*8)+(7*7)+(6*4)+(5*6)+(4*3)+(3*5)+(2*6)+(1*7)=213
213 % 10 = 3
So 874635-67-3 is a valid CAS Registry Number.

874635-67-3Relevant articles and documents

Bridgehead nitrogen heterocycles which contain the quinazoline moiety - Synthesis and cycloaddition of 1,2-dihydroquinazoline 3-oxides

Heaney, Frances,McCarthy, Tomas,Mahon, Mary,McKee

, p. 4351 - 4361 (2007/10/03)

A novel synthesis of 1,2-disubstituted 1,2-dihydroquinazoline 3-oxides 8 and the first ever examples of 1,3-dipolar trapping of these nitrones to homonuclear dipolarophiles is described. The new dipoles 8 reacted with N-methyl maleimide, generating diastereomeric adducts 14-16. In the reaction between 8 and dimethyl acetylenedicarboxylate, primary cycloadducts 17 and/or stable rearrangement products, azomethine ylides 18, are formed depending on the substitution pattern of the dipole. The structure of 18c is unambiguously assigned by X-ray crystallographic analysis. An X-ray crystal structure determination is also presented for the cyclopropylisoxazoloquinazoline 22 formed by a [3 + 2] addition of 8a to 21, the dimethyl acetylenedicarboxylate tetramer. The Royal Society of Chemistry 2005.

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