| http://www.w3.org/ns/prov#value | - Then the acetate group is displaced with gaseous hydrogen bromide or hydrogen chloride, at a low temperature such as about -50??? C. to about 0??? C. Since the gaseous hydrogen halide may tend to remove the protecting groups, especially silyl protecting groups, it is necessary to operate this step at quite a low temperature and to add the hydrogen halide slowly in small increments.
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