✦ LIBER ✦

NMR study of some coumarins and furocoumarins methylated

✍ Scribed by R. Miranda; L. Santana; E. Uriarte; G. Zagotto

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 260 KB
Volume: 50
Category: Article
ISSN: 1386-1425
DOI: 10.1016/0584-8539(94)80124-x

No coin nor oath required. For personal study only.

✦ Synopsis

The 1H and 13C NMR spectra of various methylcoumarins and methylfuroeoumarins are reported. All signals were assigned and the influence on chemical shifts of methylation at various positions was determined.

📜 SIMILAR VOLUMES

Natural abundance 17O NMR spectra of cou

Natural abundance 17O NMR spectra of coumarins, furocoumarins and related compounds

✍ Helmut Duddeck; Doris Rosenbaum; M. Hani A. Elgamal; Nagwa M. M. Shalaby 📂 Article 📅 1987 🏛 John Wiley and Sons 🌐 English ⚖ 208 KB

The 54.2 MHz I7O NMR spectra of a series of naturally occurring coumarins and furocoumarins and those of a number of related model compounds are described. The ''0 chemical shifts of the furocoumarins can be predicted by the evaluation of the data of substructures in model compounds. syn-Periplanar

13C NMR spectra of some furocoumarins

✍ Ajay K. Bose; H. Fujiwara; Vinayak S. Kamat; Girish K. Trivedi; Sasanka C. Bhatt 📂 Article 📅 1979 🏛 Elsevier Science 🌐 French ⚖ 274 KB

A novel assignment method in the 13C NMR

A novel assignment method in the 13C NMR spectroscopy of coumarins and furocoumarins

✍ Helmut Duddeck; M. Hanni A. Elgamal; Faten K. Abd Elhady; Nagwa M. M. Shalaby 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 117 KB

## Abstract The signal shifts caused by replacing the carbonyl oxygen by sulphur represent a valuable method of assignment of the ^13^C NMR signals in coumarins and furocoumarins substituted at the benzoic and furanoic rings.

IR spectra and structures of protonated

IR spectra and structures of protonated complexes of coumarins and furocoumarins

✍ M. E. Perel'son; V. P. Zvolinskii; Yu. N. Sheinker 📂 Article 📅 1972 🏛 Springer US 🌐 English ⚖ 137 KB

Proton and carbon-13 NMR spectra of some

Proton and carbon-13 NMR spectra of some 3,4-fused pyranocoumarins and furocoumarins

✍ Amarendra Patra; Samir K. Panda; K. C. Majumdar; A. T. Khan; S. Saha 📂 Article 📅 1991 🏛 John Wiley and Sons 🌐 English ⚖ 290 KB

Carbon-1 3 spectral assignments of five pyrano[3,2-c] [l]benzopyran-5(2H) -ones, five pyrano[2,3-c] [l ]benzopyran-5(2H)ones and five 2-methylfuro[2,3-c] [ l ] benzopyran-4-ones and of 2-methylfuro[3, 2-c] [l]benzopyran-4-one and 4-(2-chloroallyl)-3-hydroxycoumarin were made from mutual correlations

13C NMR of coumarins. III—Simple coumari

13C NMR of coumarins. III—Simple coumarins

✍ F. A. Macias; G. M. Massanet; F. Rodríguez-Luis; J. Salvá 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 236 KB

13C NMR data for several simple coumarins are reported. The ysvn effect of a 5-methoxy substituent on the C-4 chemical shift was observed and measured. The effects of an 8-iodo substituent on the chemical shifts of the carbons of the coumarinic skeleton are discussed.