Introduction to Pharmaceutical Organic Chemistry – PST05106 Pharmaceutical Organic Chemistry
NTA Level 5 • Semester 1 • PST05106 Introduction to Pharmaceutical Organic Chemistry Pharmaceutical Organic Chemistry • Source Session/Topic 1 Full source-text version: all educational wording from the extracted learning source is retained; only presenter/tutor metadata and web-layout noise are removed, while formatting is improved for readability. Session 1: Introduction to Pharmaceutical Organic Chemistry. Total Session Time: 120 minutes Prerequisites: PST 04210 Inorganic Chemistry Learning Tasks By the end of this session students are expected to be able to: • Define pharmaceutical organic chemistry • List characteristics of organic compounds • Explain the importance of organic chemistry in pharmacy Resources Needed: • Flip charts, marker pens, and masking tape. • Black/white board and chalk/whiteboard markers. SESSION OVERVIEW. |Step |Time |Activity/ |Content | | | |Method | | |1 |05 minutes |Presentation |Introduction, Learning Tasks | |2 |15 minutes |Buzzing. |Definition of Pharmaceutical Organic| | | |Presentation. |Chemistry. | |3 | |Brainstorming.| | | |35 minutes |Presentation. |Characteristics of Organic | | | | |Compounds. | |4 |45 minutes |Group |Importance of Organic Chemistry in | | | |discussion. |Pharmacy. | | | |Presentation. | | |5 |10minutes |Presentation |Key Points | | 6 |10 minutes |Presentation |Evaluation | SESSION CONTENT. STEP 1: Presentation of Session Title and Learning Tasks (5 minutes) READ or ASK students to read the learning tasks and clarify. ASK students if they have any questions before continuing. STEP 2: Definition of Pharmaceutical Organic Chemistry (15 minutes) |Activity: Buzzing (5 minutes) | | | |Ask students to brainstorm on the following question: | | | |What is a pharmaceutical Organic Chemistry? | | | |ALLOW few students to respond. | | | |WRITE their responses on the flip chart/ board. | | | |CLARIFY and SUMMARISE by using the content below. | • Organic Chemistry is the branch of Chemistry which deals with the study of carbon and its compounds. o However, carbon monoxide, carbon dioxide, carbonates, hydrogen carbonates, carbides and cyanides are excluded. • Pharmaceutical Organic Chemistry is the study of all substances containing carbon which are involved with design, chemical synthesis and development of bioactive molecules (drugs). • Two aspects are involved o Medicinal Chemistry – which is devoted to discovery and development of new agents for treating diseases. o Biochemistry – study of the cell & analysis of its structure to identify factors necessary for life of every cell. • Occurrence of Carbon and Sources of Organic Compounds. o Carbon is the principle element in organic compounds; most also contain hydrogen and others contain the halogens, nitrogen, oxygen, phosphorus, sulphur etc. o Occurs widely in carbohydrates, proteins, fats, vitamins, nucleic acids, hormones and synthetic materials such as drugs, ink and dyes. o Major sources are petroleum, coal and natural gases. o Other sources include wood, oils and agricultural waste products o Biggest source of organic compounds – plants & animals • The Unique Nature of Carbon o Ability to catenate ▪ Carbon atoms link together to form chains of varying length, branched chains and rings of different sizes o Ability to form four strong single covalent bonds (tetravalency) ▪ Each carbon atom has four unpaired electrons when excited, as a 4A element in the periodic table, it can share 4 valence electrons – tetravalent, Tend to form four strong covalent bonds o Ability to Form Multiple Bonds ▪ Carbon atom has the ability to form the multiple bonds links with itself. ▪ There two categories of multiple bond (i) double bonds eg C=C (ii) triple bonds eg C≡C. ▪ The compounds formed in this way have different properties from compounds of the same elements but single bond. o Carbon atom can vary in oxidation state from -4 to +4 CH4 Carbon oxidation number -4 CCl4 Carbon oxidation number +4 STEP 3: Characteristics of Organic Compounds (35 minutes). |Activity: Brainstorming (10minutes) | | | |ASK students to pair up and buzz on the following question for 5 | |minutes | | | |What are the characteristics of organic compounds? | | | |ALLOW pairs to respond on the question | | | |WRITE their response on the flip chart/board | | | |CLARIFY and SUMMARIZE by using the content in the table 1 below | The following are the characteristics of organic compounds • Covalent nature o Carbon atom from strong covalent bonds with one another, most organic compounds are stable because of the strong carbon -carbon bonds, since they have a covalent nature they do not ionizes in solution and are non-conductors of electricity. • Polarity and solubility of non-polar compounds o Carbon-hydrogen bonds are non-polar like carbon-carbon bonds; this is because of the almost equal electro negativities of the two elements. o Most of the organic compounds are non-polar unless the compounds consist of very electronegative elements like chlorine or groups like the hydroxyl group, they cannot therefore form bonds with water molecules (insoluble in water). o If an organic compound contain polar groups hydrogen bond can form between polar group in the molecule of organic compound and the water molecule. o For the example ethanol molecule contains a hydroxyl group which is polar, so it is soluble in water. • Low melting and boiling points o Organic compounds generally have low melting and boiling points than inorganic compounds; this is because these compounds possess relatively weak intermolecular bonds which can easily broke by heat energy. • Thermal instability o Many organic compounds are; thermally unstable, decomposing into simpler molecules when heated to temperature above 5000C. o However, this property is sometimes of commercial importance as in the cracking of petroleum. o This property is very useful in the fractional distillation of crude oils. • Flammability o Most organic compounds are flammable (catch fire easily) and burn exothermically in a plentiful supply of air to yield carbon (IV) oxide and water. o Thus, most fuels such as woods, coal, oil, petrol and natural gas are organic, and their combustion provides our main source of heat energy. • Reactivity o Reactions involving organic