✦ LIBER ✦

Structural elucidation and total assignment of the 1H and 13C NMR spectra of new chalcone dimers

✍ Scribed by Mary Anne M. Bandeira; F. J. de A. Matos; R. Braz-Filho

Publisher: John Wiley and Sons
Year: 2003
Tongue: English
Weight: 117 KB
Volume: 41
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1292

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Conventional 1D NMR methods and 2D shift‐correlated NMR experiments (COSY, HMQC, HMBC) were used for the structural elucidation and ^1^H and ^13^C chemical shifts assignments of four new types of chalcone dimers isolated from Myracrodruon urundeuva. Copyright © 2003 John Wiley & Sons, Ltd.

📜 SIMILAR VOLUMES

Total assignment of 1H and 13C NMR spect

Total assignment of 1H and 13C NMR spectra of two isomeric triterpenoids

✍ F. J. Q. Monte; J. P. Kintzinger; R. Braz-Filho 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 204 KB 👁 2 views

The complete 1H and 13C assignment of two closely related isomeric triterpenoid derivatives (methyl 2a,3b-di-Oacetylolean-12-en-28-oate and methyl 2a,3a-di-O-acetylurs-12-en-28-oate) is described. In addition to 1D NMR methods, 2D shift-correlated NMR techniques (COSY, NOESY, HMBC and HMQC) were use

Total assignment of 1H and 13C NMR spect

Total assignment of 1H and 13C NMR spectra of tectol and tecomaquinone I

✍ Telma L. G. Lemos; Sonia M. O. Costa; Otilia D. L. Pessoa; R. Braz-Filho 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 52 KB 👁 2 views

Conventional one-dimensional NMR methods and two-dimensional shift-correlated NMR experiments (COSY, HMQC, HMBC) were used for 1 H and 13 C chemical shift assignments of two naphthoquinone dimers tectol and tecomaquinone I isolated from Lippia sidoides.

Total assignment of the 1H and 13C spect

Total assignment of the 1H and 13C spectra of peridinin

✍ Stewart McLean; William F. Reynolds; Lisa M. D. John; Winston F. Tinto 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 204 KB 👁 1 views

## Abstract Complete ^1^H and ^13^C spectral assignments are reported for peridinin, the major dinoflagellate carotenoid responsible for ‘red tides’ in the ocean. These assignments were made with the aid of HETCOR, FLOCK and COSY 2D spectra and NOE difference spectra.

Structure elucidation and total assignme

Structure elucidation and total assignment of 1H and 13C NMR data for a new bisdesmoside saponin from Cordia piauhiensis

✍ Renata P. Santos; Francisco A. Viana; Telma Leda G. Lemos; Edilberto R. Silveira 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 104 KB 👁 1 views

## Abstract Extensive 1D (^1^H NMR, HBBD‐^13^C NMR, DEPT‐^13^C NMR) and 2D (COSY, TOCSY, NOESY, HMQC and HMBC) NMR analysis was used to characterize the structure of a new bisdesmoside saponin isolated from the methanol extract of stems of __Cordia piauhiensis__ Fresen as 3β‐__O__‐[α‐L‐rhamnopyrano

Total assignment of the 1H and 13C NMR s

Total assignment of the 1H and 13C NMR spectra of casimiroedine and its peracetylated derivative

✍ William F. Reynolds; Raul G. Enriquez; Gil A. Magos; Dino Gnecco 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 51 KB 👁 2 views

The rare alkaloid casimiroedine and its peracetylated derivative both show complex 1 H and 13 C spectra with almost all signals doubled owing to slow rotation about the amide bond. Nevertheless, it is possible, using 2D NMR methods, to assign fully the 1 H and 13 C spectra of the major and minor con

Total assignment of 1H and 13C NMR spect

Total assignment of 1H and 13C NMR spectra of two isomeric cucurbitane triterpenoids

✍ F. J. Q. Monte; S. M. A. Papa; J. P. Kintzinger; R. Braz-Filho 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 55 KB 👁 2 views

The complete 1 H and 13 C chemical shift assignment of two closely related isomeric triterpenoids, 3˛,16˛,20(R),25-tetrahydroxy-2,11,22-trioxocucurbita-5,23(E)-diene and 3ˇ,16˛,20(R)-trihydroxy-25-acetoxy-2,11,22trioxocucurbita-5,23(E)-diene, making use of one-and two-dimensional NMR techniques (HMB