✦ LIBER ✦

The structure of gascardic acid from an x-ray diffraction study

✍ Scribed by Robert K. Boeckman Jr.; David M. Blum; Edward V. Arnold; Jon Clardy

Publisher: Elsevier Science
Year: 1979
Tongue: French
Weight: 235 KB
Volume: 20
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)86662-4

No coin nor oath required. For personal study only.

✦ Synopsis

The complete structure of the unique tricyclic sesterterpene gascar ic acid is proposed based on a single crystal x-ray diffraction analysis of the dicyclohexylammonium salt. While the number of known sesterterpenes (Cz5 terpenes) is slowly increasing, they remain the rarest and least well understood class of terpenoid natural products. The sesterterpenes encompass a number of unique carbon skeletons, ring sizes and stereochemical relationships which have provided considerable challenges in structure elucidation and biosynthetic interpretation. 2 Gascardic acid, a lac acid isolated in the late 1950's,3 was the subject of intensive scrutiny by Polonsky, Arigoni and their collaborators and these efforts resulted in expression

📜 SIMILAR VOLUMES

An “acid” structure for polyriboguanylic

An “acid” structure for polyriboguanylic acid observed by X-ray diffraction

✍ Steven B. Zimmerman 📂 Article 📅 1975 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 127 KB 👁 1 views

## A n "Acid" Structure for Polyriboguanylic Acid Observed b y X-Kuy Diffraction We report here 1 he application to polyrihoguanylic acid (poly rC;) of a techriiyue used to form solids nit h partial inolecular orientat ion by freairig of acidic. soli~tions.~ The freezing casts the pol>-mer inoleri

An X-ray diffraction study on artificial

An X-ray diffraction study on artificial multilayered structure

✍ Liu Wen; Jiang Xiaoming; Xu Chen; Wu Zi-qin 📂 Article 📅 1988 🏛 Elsevier Science 🌐 English ⚖ 217 KB

X-ray diffraction study of acid aniliniu

X-ray diffraction study of acid anilinium dodecatungstenphosphate

✍ G. Z. Kaziev; A. A. Dutov; S. H. Quinones; A. M. Koroteev; V. K. Bel’skii; A. I. 📂 Article 📅 2005 🏛 SP MAIK Nauka/Interperiodica 🌐 English ⚖ 134 KB

An X-ray diffraction study of the SrBrxI

An X-ray diffraction study of the SrBrxI2−x system

✍ Stanislaw A. Hodorowicz; Harry A. Eick 📂 Article 📅 1983 🏛 Elsevier Science 🌐 English ⚖ 552 KB

The structure of benzoyldimedone from X-

The structure of benzoyldimedone from X-ray diffraction analysis

✍ E. V. Borisov; A. I. Verenich; A. A. Govorova; A. S. Lyakhov; T. S. Khlebnikova 📂 Article 📅 2000 🏛 Springer 🌐 English ⚖ 274 KB

X-Ray diffraction studies on the structu

X-Ray diffraction studies on the structure of water

✍ J. Heemskerk 📂 Article 📅 2010 🏛 Elsevier Science 🌐 English ⚖ 492 KB

## Abstract The X‐ray diffraction of water was measured at 0°, 25° and 45°. An improved method has been used for the calculation of the distribution functions from the experimental data. This method was checked on the data for vitreous SiO~2~ The interpretation of the distribution curves for water