Timeline of the Great Recession. A recession is when a country experiences two or more quarters of contraction in their economy. GDP in the United States had averaged around 1% per quarter prior to 2007, but beginning in the fourth quarter, those numbers started to shrink.
Oligosaccharides is a general term to cover simple sugars: oligo means few, saccharide means sugar. Carbohydrates include sugars (monosaccharides and disaccharides) - which have fairly simple molecules - and more complicated molecules called polysaccharides, which are built up by condensation.
Enols are important intermediates in many reactions of aldehydes and ketones including carbonyl condensation reactions. A carbonyl condensation reaction takes place between two carbonyl partners and involves both nucleophilic addition and Î±-substitution. One carbonyl is converted by base into a nucleophilic enolate ion, which then adds to the electrophilic carbonyl group of the second compound.