enamineenantiofaceenantiomerenantiomorphend centered unit cellend groupend pointend productendergonicendo positionendocyclic double bondendoergicendothermicendothermic reactionendothermic solutionendothermicityenentiotopic groupsenergyenergy bandenergy barrierenergy conservationenergy contentenergy dissipationenergy eigenstateenergy levelenergy of activationenergy of vibrationenergy patternenergy shellenergy stateenergy transferenlarging adapterenolenol etherenolate anionenolizationenoneenrichmententering groupenthalpyenthalpy of formationenthalpy of fusionenthalpy of sublimationentropyenzymeeolotropyepimerepoxidationepoxideequation of state