This means the reaction takes place in the presence of oxygen from the air. Oxygen is used as an oxidant in the reaction.
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2-(DIMETHYLAMINO)ETHANETHIOL
[PdBr(C6H3(C3NOH(OC2H5))2)]
C13H13ClO
Benzofuran, 5-bromo-2-phenyl-
(2R,6R,7R)-1-aza-3-methylene-7-<5R-5-p-nitrobenzyloxycarbonylamino-5-p-nitrobenzyloxycarbonylpentaamido>-8-oxo-5-thia-bicyclo<4.2.0>octane-2-carboxylic acid p-nitrobenzyl ester