Detail of "4352-89-0"

CAS Number:
4352-89-0
Name:
3H-Naphtho[2,1-b]pyran-3-one
Molecular Structure:
Formula:
C₁₃H₈O₂
Molecular Weight:
196.2014
Synonyms:
1-Naphthaleneacrylicacid, 2-hydroxy-, d-lactone (6CI);2-Propenoic acid, 3-(2-hydroxy-1-naphthalenyl)-, d-lactone;5,6-Benzocoumarin;Benzo[f]chromen-3-one;b-Naphthocoumarin;
Density:
1.297 g/cm³
Boiling Point:
402.6 °C at 760 mmHg
Flash Point:
169.7 °C

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Basicities of methyl-substituted coumarins: Basicities of methyl-substituted coumarins. Takeda, Shinichi; Taumi, Toshiya; Takeno, Noboru (Dep. Ind. Chem., Muroran Inst. Technol., Muroran 050, Japan). Nippon Kagaku Kaishi, (11), 1673-7 (Japanese) 1983.There are some reagents with their cas registry numbers 79252-42-9 and 4352-89-0 are used in this study. CODEN: NKAKB8. ISSN: 0369-4577. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) Basicities of Me-substituted coumarins I (R = Me, n = 1-5; Rn = benzo) were detd. by the spectrophotometric method. The introduction of Me group at the C-4 position increased the basicity, whereas the Me substitution at the C-3 position gave no effect. Introduction of two Me groups at both C-3 and C-4 positions greatly enhanced the basicity. The Hammett relationship between the basicity and Ss of Me substituents in the benzene ring held for 3-Me, 4-Me, 3,4-di-Me and unsubstituted coumarins. The HMO calcns. were also carried out for these coumarins. The DEx values for the acid-base equil. and the p-electron ds. on the carbonyl O showed fairly well linear correlations with the obsd. pKa values. .