SEARCH Articles Figures Tables 0—Bond metathesis four-center transition state 1,2-Addition four-center transition state 1,4-addition four-centered mechanisms 2,5-distyrylpyrazine four-center-type photopolymerization 2,5-distyrylpyrazine four-center-type polymerization Condensation, four-center Cyclic four-center transition Cycloaddition (Four-Center) Polymerization Decomposition of the Four-Center Interactions Enhancer Four-centered transition state Exchange reaction, four-center Five-Center, Four-Electron Bonding Structures Five-center four-electron bonding Four center condensation method Four-Center Hydrogen Bonds Four-center addition Four-center bonds Four-center elimination Four-center elimination reactions Four-center interaction Four-center intermediate Four-center mechanism, addition Four-center mechanisms Four-center metathesis Four-center photopolymerization Four-center polymerization Four-center process Four-center reaction mechanism Four-center reaction orbital symmetry Four-center reactions Four-center reactions, hydroboration Four-center three-electron bonding Four-center transition state metathesis Four-center two-electron bonding Four-center, two-electron Four-center, two-electron bonds Four-center-type photopolymerization Four-center-type photopolymerization diolefins Four-center-type polymerization Four-centered transition Four-centered transition state Four-coordinated metal centers Halogenoargentate ions four-coordinated metal centers Halogenocuprate ions four-coordinated metal centers Hydrogen four center Hydrogen four-centered Integral four-center Metrical Aspects of Three- and Four-Center Hydrogen Bonds Three center four electron bond model Three-center four-electron bond Three-center, four-electron Three-center, four-electron bonding interactions Three-center, four-electron hyperbonding Transition states four-center Ugi four-center three-component reaction