Calculation‐Assisted Stereochemical Analysis of Securingine A

2020 ◽  
Author(s):  
Gyumin Kang ◽  
Mu‐Hyun Baik ◽  
Sunkyu Han
Keyword(s):  
Stereochemical Analysis

Stereochemical Analysis of an Aromatic Triplet Di-?-methane Rearrangement

1986 ◽  
Vol 69 (8) ◽  
pp. 1936-1958 ◽  
Author(s):  
Bernhard Scholl ◽  
Hans-J�Rgen Hansen
Keyword(s):  
Stereochemical Analysis

Cyclic ketals of 9-fluorenone: Advanced organic laboratory exercise in synthesis and stereochemical analysis using 13C NMR

1991 ◽  
Vol 68 (9) ◽  
pp. 796 ◽  
Author(s):  
Paul R. Rablen ◽  
Mark A. Deuber ◽  
Ai Ching Lim ◽  
Robert M. Dickson ◽  
Claude E. Wintner
Keyword(s):  
13C Nmr ◽  
Laboratory Exercise ◽  
Stereochemical Analysis ◽  
Organic Laboratory

Steric effects on nitrogen-15 chemical shifts of 4-aminooxanes (tetrahydropyrans), 4-aminothianes, and the corresponding N,N-dimethyl derivatives. Use of nitrogen-15 shifts as an aid in stereochemical analysis of these heterocyclic systems

1982 ◽  
Vol 47 (10) ◽  
pp. 1933-1935 ◽  
Author(s):  
Pullachipatti K. Subramanian ◽  
Nallappan ChandraSekara ◽  
Kondareddiar Ramalingnam ◽  
Phanviet M. Tan ◽  
George C. Levy ◽  
...  
Keyword(s):  
Chemical Shifts ◽  
Steric Effects ◽  
Stereochemical Analysis

Mechanisms of sulphate activation and transfer

1991 ◽  
Vol 332 (1263) ◽  
pp. 141-148 ◽  
Keyword(s):  
Reaction Pathway ◽  
General Strategy ◽  
Inorganic Pyrophosphate ◽  
Aps Kinase ◽  
Stereochemical Analysis ◽  
Ping Pong ◽  
Inorganic Sulphate ◽  
Widespread Phenomenon ◽  
The Common ◽  
Enzyme Intermediate

Sulphation of natural products is a widespread phenomenon. Inorganic sulphate is transported into cells and activated by ATP sulphurylase, an enzyme that has been studied by kinetic and stereochemical methods. It has been shown that the enzyme catalyses the displacement of inorganic pyrophosphate by inorganic sulphate from Pa of ATP by a direct 'in line’ mechanism. The adenosine 5'-phosphosulphate formed is then phosphorylated at the 3' position by APS kinase to give 3'-phosphoadenosine 5'- phosphosulphate, the common sulphating species in biology. A general strategy for the synthesis of chiral [ 16 O 17 O 18 O]-sulphate esters has been established and a method developed for their stereochemical analysis by using Fourier Transform Infrared Spectroscopy. The stereochemical course of an aryl sulphotransferase from Aspergillus oryzae has been shown to proceed with retention of configuration at sulphur, supporting a ping pong type mechanism with a sulpho-enzyme intermediate on the reaction pathway.

Stereochemical analysis of γ-HCH degradation by Pseudomonas paucimobilis UT26

Chemosphere ◽  
1993 ◽  
Vol 26 (6) ◽  
pp. 1187-1201 ◽  
Author(s):  
Satoru Nagasawa ◽  
Ryoichi Kikuchi ◽  
Yuji Nagata ◽  
Masamichi Takagi ◽  
Masatoshi Matsuo
Keyword(s):  
Stereochemical Analysis ◽  
Pseudomonas Paucimobilis

Semiempirical calculation of 13C nuclear magnetic resonance chemical shifts of acyclic hydrocarbons. Application to the stereochemical analysis of steroidal side chains

1988 ◽  
Vol 66 (1) ◽  
pp. 71-75 ◽  
Author(s):  
Manuel Gonzalez-Sierra ◽  
Daniel A. Bustos ◽  
Edmundo A. Ruveda ◽  
Alejandro C. Olivieri ◽  
Mariano Grasselli
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shifts ◽  
Side Chains ◽  
Stereochemical Analysis ◽  
Microcomputer Program ◽  
Semiempirical Approach ◽  
13C Nuclear Magnetic Resonance ◽  
Acyclic Hydrocarbons ◽  
Nuclear Magnetic

A semiempirical approach for predicting 13C nuclear magnetic resonance chemical shifts of acyclic hydrocarbons has been adapted to a microcomputer program. A series of methyl and dimethyl substituted cholesterols has been studied using this program, and the predicted shifts are in agreement with literature reports. Preferred conformations of the steroidal side chains have been also predicted and agree with previous studies. A simple rule for analyzing the trends in the chemical shift of the carbon C-20, which is sensitive to changes in the configuration at C-22, is also given, not only for hydrocarbon side chains but also for hydroxy substituted compounds.

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