CHEM1831 Lecture Notes - Lecture 20: Benzene, Structural Isomer, Vegetable Oil
9 Aug 2018
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Document Summary
Hydrocarbons: alkanes, alkenes, alkynes, aromatics, alkenes and alkynes, contain double or tripple bonds, sometimes called unsaturated hydrocarbons", e. g, prostaglandin - induces labour, cholestrol, 17-ethynylestradiol - contraceptive, capulin - naturally occuring fungicide. 2-butene: the double bond imparts planarity and rigidity on the structure, two isomeric forms are possible. Biological implications: fatty acids: fatty acids are organic molecules containing long hydrocarbon chains (c10 to c18), they are important components of cell membranes, saturated fats and trans - pack together well - relatively high melting points. But cis fats are different: one (or more) cis double bonds produces a significant bend", chains cant pack together so efficiently, result: lower melting points, and more fluid" cell membranes. 2^4 = 16: all trans isomer is a vitamin a. Reactions of alkenes: the major type of reaction that alkenes undergo is addition, they pi-bond is broken leaving a single (o) bond linking the two carbon atoms.
