In heterogeneous catalysis, the catalyst is in a different phase from the reactants. SDS of cas: 16251-45-9, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 16251-45-9, name is (4S,5R)-4-Methyl-5-phenyloxazolidin-2-one. In an article，Which mentioned a new discovery about 16251-45-9
In reactions of (2,3-anti)-3-amino-1,2-diols with diphosgene and phosgene and their conversion into 1,3-oxazolidin-2-ones, some differences in the stereochemistry of the reactions have been found with these two reagents. The reactions with phosgene afforded the expected cis-oxazolidinones, and in the reaction with diphosgene under the same reaction conditions, the trans-oxazolidinones were also obtained.
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Reference：
Oxazolidine – Wikipedia,
Oxazolidine | C3H2161NO – PubChem