Solid-State13C Chemical Shift Tensors in Terpenes. 3. Structural Characterization of Polymorphous Verbenol

2000 ◽  
Vol 122 (15) ◽  
pp. 3708-3714 ◽  
Author(s):  
James K. Harper ◽  
David M. Grant
Keyword(s):  
Chemical Shift ◽  
Structural Characterization ◽  
Chemical Shift Tensors

Hydrotelluration of acetylenic esters: structural characterization of stereoisomers of methyl/ethyl β-(aryltelluro)acrylates

RSC Advances ◽  
2015 ◽  
Vol 5 (72) ◽  
pp. 58246-58254 ◽  
Author(s):  
Bandana Singh ◽  
Ashok K. S. Chauhan ◽  
Ramesh C. Srivastava ◽  
Andrew Duthie ◽  
R. J. Butcher
Keyword(s):  
Solid State ◽  
Chemical Shift ◽  
Structural Characterization ◽  
Methyl Ethyl ◽  
Acetylenic Esters ◽  
Solid State Structures

Synthesis of tellurated acrylates, ArTeCHCHCOOR and their solid state structures have been explored. The 125Te chemical shift and 2J(1H–125Te) are useful indicators of their geometry in solution.

Structural characterization of protonated benzeneseleninic acid, the dihydroxyselenonium ion

2000 ◽  
Vol 56 (6) ◽  
pp. 1029-1034 ◽  
Author(s):  
Henning Osholm Sørensen ◽  
Nicolai Stuhr-Hansen ◽  
Lars Henriksen ◽  
Sine Larsen
Keyword(s):  
Hydrogen Bond ◽  
Chemical Shift ◽  
Structural Characterization ◽  
Strong Acid ◽  
Crystallization Behaviour ◽  
Methyl Group ◽  
Bond Lengths ◽  
Pyramidal Configuration

The structure of the dihydroxyphenylselenonium ion (C_{6}H_{7}O_{2}Se^{+}) has been determined in its benzenesulfonate (C_{6}H_{5}O_{3}Se^{-}) and p-toluenesulfonate (C_{7}H_{7}O_{3}S ^{-}) salts. Whereas the former salt is disordered, the latter less dense salt is well defined. This difference in crystallization behaviour is attributed to a C—H...O hydrogen bond involving the methyl group of the p-toluenesulfonate ion. The two salts display very similar hydrogen-bond arrangements and differ only with respect to the stacking of the phenyl groups. The dihydroxyselenonium ion is a strong acid with a pK value of −0.9 determined from the variation of the 77Se chemical shift. A comparison with the two deprotonated species reveals a systematic increase in the Se—O bond lengths and the pyramidal configuration around Se with the number of protons attached.

Sign in / Sign up

Export Citation Format

Share Document