Determination of serum creatinine by isotope dilution mass spectrometry as a candidate definitive method

Dess−Martin Periodinane Oxidation of Alcohols in the Presence of Stabilized Phosphorus Ylides: A Convenient Method for the Homologation of Alcohols via Unstable Aldehydes

Chemistry remains an experimental science. The theory of chemical bonding leaves much to be desired. Yet, the past 20 years have been marked by a fruitful symbiosis of organic chemistry and molecular orbital theory. Of necessity this has been a marriage of poor theory with good experiment. Tentative conclusions have been arrived a t on the basis of theories which were such a patchwork on approximations that they appeared to have no right to work; yet, in the hands of clever experimentalists, these ideas were transformed into novel molecules with unusual properties. In the same way, by utilizing the most simple but fundamental concepts of molecular orbital theory we have in the past 3 years been able to rationalize and predict the stereochemical course of virtually every concerted organic reaction.' In our work we have relied on the most basic ideas of molecular orbital theory-the concepts of symmetry, overlap, interaction, bonding, and the nodal structure of wave functions. The lack of numbers in our discussion is not a weakness-it is its greatest strength. Precise numerical values would have to result from some specific sequence of approximations. But an argument from first principles or symmetry, of necessity qualitative, is in fact much stronger than the deceptively authoritative numerical result. For, if the simple argument is true, then any approximate method, as well as the now inaccessible exact solution, must obey it. The simplest description of the electronic structure of a stable molecule is that i t is characterized by a finite band of doubly occupied electronic levels, called bonding orbitals, separated by a gap from a corresponding band of unoccupied, antiboding levels as well as a continuum of higher levels. The magnitude of the gap may range from 40 kcal/mole for highly delocalized, large aromatic systems to 250 kcal/mole for saturated hydrocarbons. It should be noted in context that socalled nonbonding electrons of heteroatoms are in fact bonding. Consider a simple reaction of two molecules to give a third species, proceeding in a nonconcerted manner through a diradical intermediate I. A + B + [I] + C

The Conservation of Orbital Symmetry (福井謙一とフロンティア軌導理論) -- (参考論文)

Fumaraldehyde monodimethyl acetal: An easily accessible and versatile intermediate.

Calculation of vibronic spectra of polyatomic molecules in the franck—condon and herzberg—teller approximations: Part I. Methods for calculating matrix elements

CONTENTS I. Introduction 119 II. Basic concepts of the structure of organic compounds 120 III. Quantum-mechanical studies of conjugated compounds 124 IV. The vibrational spectra of conjugated compounds 129

https://iopscience.iop.org/article/10.1070/RC1968v037n02ABEH001619/pdf

The Structure of Conjugated Open-chain Hydrocarbons

http://link.springer.com/content/pdf/10.1007/BF00911371.pdf

Chemistry of acetals: Communication 13. Study of the hydrolysis of some diacetals by means of gas-liquid chromatography

1.

Three ways of synthesizing polyenic dicarboxylic acids having even numbers of double bonds are proposed.




2.

A new method of synthesizing corticrocin diethyl ester is described.




3.

The difficulty with which the cis bond in 6-cis-corticrocin diethyl ester is isomerized is pointed out.

Chemistry of polyenic and polyacetylenic compounds communication 8. Methods of synthesizing polyenic dicarboxylic acids having even numbers of double bonds and also polyenynic dicarboxylic acids

Semi-empirical Quantum-mechanical Methods for the Calculation ofMolecular Geometry and

http://link.springer.com/content/pdf/10.1007/BF01134723.pdf

Chemistry of acetals: Communication 14. Preparation of polyenic aldehydic esters, their acetals, and symmetrical and unsymmetrical polyenic dicarboxylic esters

G. A. Kogan

Papers

The Structure of Conjugated Open-chain Hydrocarbons

Chemistry of acetals: Communication 13. Study of the hydrolysis of some diacetals by means of gas-liquid chromatography

Chemistry of polyenic and polyacetylenic compounds communication 8. Methods of synthesizing polyenic dicarboxylic acids having even numbers of double bonds and also polyenynic dicarboxylic acids

Semi-empirical Quantum-mechanical Methods for the Calculation ofMolecular Geometry and

Chemistry of acetals: Communication 14. Preparation of polyenic aldehydic esters, their acetals, and symmetrical and unsymmetrical polyenic dicarboxylic esters