Chemistry 2223B Lecture Notes - Lecture 4: Hemiacetal, Sorbose, Lyxose
10 Feb 2016
School
Department
Course
Professor
Document Summary
(cid:120) chart of d-aldoses (included on exams you can use this to draw l-aldoses) Talose (cid:120) chart of d-ketoses (included on exams you can use this to draw l-ketoses) While this chart is not provided on exams, you should be able to draw them using the other two charts if the name is provided (e. g. 2-deoxy-2-amino-d-glucose can be drawn from d-glucose). Carbohydrates (cid:121) 14 (cid:120) monosaccharides have hydroxyl and carbonyl groups that can react together and form hemiacetals. These names originate from compounds furan and pyran. O (cid:120) hemiacetal formation most commonly involves the oh on the penultimate carbon. Fischer projections are not convenient for cyclic compounds, so a. Haworth projection (side view) is used. (cid:120) self-study: review the mechanisms for acid-catalyzed and based-catalyzed hemiacetal formation (reversible). Oh (cid:120) a new stereocentre is formed a squiggly line indicates undefined stereochemistry.
