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21139-18-4

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21139-18-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21139-18-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,1,3 and 9 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 21139-18:
(7*2)+(6*1)+(5*1)+(4*3)+(3*9)+(2*1)+(1*8)=74
74 % 10 = 4
So 21139-18-4 is a valid CAS Registry Number.

21139-18-4Relevant articles and documents

Crystal engineering of neutral N-arylpyrimidinones and their HCI and HNO3 adducts with a C-H···O supramolecular synthon. Implications for non-linear optics

George,Nangia,Muthuraman,Bagieu-Beucher,Masse,Nicoud

, p. 1520 - 1527 (2007/10/03)

In a previous crystallographic study of some N-arylpyrimidinones 1, we noted that: (1) C-H···O hydrogen bonds connect molecules in a linear array; (2) the charge transfer axis of the chromophore is aligned with the main symmetry operator of point groups 2

Photochemical Ring Opening of Pyrimidin-2(1H)-ones. Part 2.

Nishio, Takehiko,Omote, Yoshimori

, p. 239 - 242 (2007/10/02)

The photochemical reactions of 1-aryl-4,6-disubstituted pyrimidin-2(1H)-ones have been examined.Irradiation of 1-aryl-4,6-disubstituted pyrimidin-2(1H)-ones (1)-(6) in benzene in the presence of primary or secondary amines gave arylimine products(10)-(15)

PHOTOCHEMICAL REACTION OF PYRIMIDIN-2(1H)-ONES: INTER- AND INTRAMOLECULAR HYDROGEN ABSTRACTION BY THE NITROGEN OF IMINO GROUP

Nishio, Takehiko,Katahira, Katsuhiro,Omote, Yoshimori

, p. 1675 - 1678 (2007/10/02)

Irradiation of 1-methyl-4,6-diphenylpyrimidin-2(1H)-one (1a) in acyclic or cyclic ethers afforded the C-C bonded 1:1-adducts (2a-c) of 1a and ether via intermolecular hyrogen abstraction of the excited imino nitrogen of 1a, while irradiation of 1-phenyl-4-(3-ethoxypropyl)-6-methylpyrimidin-2(1H)-one (1g) gave 1-phenyl-4,6-dimethylpyrimidin-2(1H)-one (1d) via intramolecular hydrogen abstraction of the excited imino nitrogen of 1g, in addition to 2-oxo-1,3-diazabicyclohex-5-ene derivative (3g).

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