Matrix FTIR study of products of benzene transformations in a pulsed glow discharge at low pressure in highly diluted mixtures of benzene with argon in the presence and absence of small oxygen additions has been carried out. Formation of the following hydrocarbon species has been established: acetylene, butadiyne, fulvene, benzvalene, methane, ethylene, phenyl, ethynyl and butadiynyl radicals. It has been shown that oxygen additions mainly result in deep oxidation of benzene to CO2, CO and H2O, although some products of intermediate oxidation have been detected. Those are formaldehyde, formyl radical, ketene, ketenyl radical, propadiene-1,3-dione, propadien-3-on-1-ilyden and hydroperoxyl radical. At the same time, it has unexpectedly been found that oxygen additions strongly increase the yield of butadiyne. Possible pathways, leading to formation of the listed species have been discussed on the basis of the obtained data and results reported in the literature.