Search results
Results from the WOW.Com Content Network
This is a list of unsolved problems in chemistry. Problems in chemistry are considered unsolved when an expert in the field considers it unsolved or when several experts in the field disagree about a solution to a problem.
Organic Compounds National Institute of Advanced Industrial Science and Technology (AIST), Japan Organic compounds Spectra:IR Raman MASS ESR 1 H NMR 13 C NMR SDBS No curated "SDBS". 34,000 Serum Metabolome Database: The Metabolomics Innovation Centre: found in blood serum "Serum Metabolome DB". 4,651 Solvent Selection Tool ACS Green Chemistry ...
It is commonly used for the identification of organic compounds from electron ionization mass spectrometry. [ 3 ] [ 4 ] Organic chemists obtain mass spectra of chemical compounds as part of structure elucidation and the analysis is part of many organic chemistry curricula.
For that, a specific task in science was chosen: help organic chemists in identifying unknown organic molecules, by analyzing their mass spectra and using knowledge of chemistry. [1] It was done at Stanford University by Edward Feigenbaum , Bruce G. Buchanan , [ 2 ] Joshua Lederberg , and Carl Djerassi , along with a team of highly creative ...
In physical organic chemistry, the Grunwald–Winstein equation is a linear free energy relationship between relative rate constants and the ionizing power of various solvent systems, describing the effect of solvent as nucleophile on different substrates. The equation, which was developed by Ernest Grunwald and Saul Winstein in 1948, could be ...
The Taft equation is a linear free energy relationship (LFER) used in physical organic chemistry in the study of reaction mechanisms and in the development of quantitative structure–activity relationships for organic compounds. It was developed by Robert W. Taft in 1952 [2] [3] [4] as a modification to the Hammett equation. [5]
Woodward's rules, named after Robert Burns Woodward and also known as Woodward–Fieser rules (for Louis Fieser) are several sets of empirically derived rules which attempt to predict the wavelength of the absorption maximum (λ max) in an ultraviolet–visible spectrum of a given compound.
The rule states that with the addition of a protic acid HX or other polar reagent to an asymmetric alkene, the acid hydrogen (H) or electropositive part gets attached to the carbon with more hydrogen substituents, and the halide (X) group or electronegative part gets attached to the carbon with more alkyl substituents. This is in contrast to ...