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Note the factors that affect the rates of these reactions like redox potential , pH , and temperature to name a few . A number of theories have been used to explain and predict the rates of these reactions , but none has been successful for some of the most complex reactions . The genetics of MDMV reaction has proven to be a difficult and controversial problem . Using ACD / Labs ' predictive tools in the Arthur environment , scientists can predict the physicochemical properties of their molecular structures , predict the multinuclear NMR spectra of their reaction products , and generate chemical names , either IUPAC or CAS Index , to populate their databases with systematic nomenclature . Since such modeling depends only on the nature of the reactants and products ( i.e ., the stoichiometry ) of the metabolic transformations , rather than the rates of these reactions ( kinetics ) , most of the necessary data for building the model can be derived directly from annotated genomes , in some cases using artificial intelligence based pathway synthesis algorithms . Arthur users will gain the capacity to predict the physicochemical properties of their molecular structures , predict the multinuclear NMR spectra of their reaction products , and generate chemical names , either IUPAC or CAS Index , to populate their databases with systematic nomenclature . Vitamin E or tocopherol , is in the lipid membranes of cells and it stops these kinds of chain reactions by becoming a free radical that is stable and not reactive . These chapters include a very good discussion on crystal field theory , rates of substitution reactions , and electron-transfer reactions . Arthur users can add the ability to predict the physicochemical properties of their molecular structures , predict the multinuclear NMR spectra of their reaction products , and generate chemical names , based on either IUPAC or CAS Index rules , to populate their structure databases with systematic nomenclature .