These reactions often compete with substitution reactions.
In one reaction of this type, aldoses are treated with hydroxylamine, followed by reaction with acetic anhydride and then sodium methoxide in methanol solvent. In another reaction of this type, alcohols are reacted with carbon disulfide and methyl iodide under basic conditions to form a xanthate intermediate, which then undergoes a CopeÂ­type rearrangement. That transformation is named for Chugaev. The last mechanistic step of the Suzuki coupling is a reduction reaction of this type. When this reaction is concerted and (*) biomolecular, the relevant substituent must be in an antiperiplanar relationship with a hydrogen atom. Bases with low nucleophilicity, like potassium tertÂ­butoxide, favor reactions of this type. These processes are also favored at high temperatures due to their large positive changes in entropy. These reactions often compete with substitution reactions. For 10 points, name these organic reactions in which substituents are removed from a molecule. 
In one reaction of this type, aldoses are treated with hydroxylamine, followed by reaction with acetic anhydride and then sodium methoxide in methanol solvent.
elimination  reactions [accept  degradation  reactions until "carbon disulfide" is read]