Organic Chemistry Interactive Notes by Chapter 3: Functional Groups/Alkanes and Cycloalkanes
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1 rganic Chemistry Interactive Notes by Chapter 3: Functional Groups/Alkanes and Cycloalkanes ther functional groups Thiols R-S (skunk and additive to natural gas) Nitro R-N 2 thers like imine, enamine, sulfonate, phosphonate.
2 Identify Functional Groups: Taxol (anticancer). rganic Chemistry Interactive Notes by 3 C 3 C N Mifepristone (RU 486) 3 C N Strychnine N 3 C 3 C N Tetradotoxin puffer fish poison Erythrosine - Red #3 N N 2 + I I N I I
3 rganic Chemistry Interactive Notes by Alkanes: Relatively inert hydrocarbons Straight Chain Saturated ydrocarbons Name Molecular Formula Structural Formula Number of Isomers Boiling Point ( o C) Methane C 4 C Ethane C Propane C 3 8 C Butane C 4 10 C 2 C Pentane C 5 12 (C 2 ) exane C 6 14 (C 2 ) eptane C 7 16 (C 2 ) ctane C 8 18 (C 2 ) Nonane C 9 20 (C 2 ) Decane C (C 2 ) Undecane, Dodecane,. Note these trends. The names are weird up to 4 and normal greek prefixes after. The formulas and structures of these alkanes increase uniformly by C 2 These formulas all fit the formula C n 2n+2 the highest possible /C ratio Since the /C ratio in these compounds is at a maximum, we call them saturated. Isomers result from different arrangements of molecular framework that are composed from the same molecular formula. For example, saturated arrangement of 4 carbons give two possible Lewis structures. Straight and branched. C C C C C C C C Draw these as condensed structures Draw these as line structure drawings. 5 carbons -- arranged in 3 possible ways -- straight, one branch and 2 branches. 3 C C 2 C C 2 3 C 2 3 C C2 C3 C 3 C C 3 C Draw these as condensed structures
4 rganic Chemistry Interactive Notes by Draw these as line structure drawings. Practice: Draw all five of the 6-carbon isomers. It helps if you name them. Alkyl Groups-Substituents Name Formula Condensed Formula IUPAC Name Comments Methyl - 3 C * Methyl Methyl Ethyl -C 2 3 C C 2 * Ethyl 1 0 Propyl -C 2 C 2 Isopropyl -CC( ) 2 Butyl -C 2 C 2 C 2 * C C Propyl C C * (1-methylethyl)- 2 0 Branched 3 C C 2 * C 2 C Butyl (2-methylpropyl) 1 0 Branched Isobutyl -C 2 CC( ) 2 sec-butyl -C( )C 2 3 C 3 C C * C 2 C 2 * C (1-methylpropyl) 2 0 tert-butyl -C( ) 3 3 C C * (1,1-Dimethylethyl) 3 0 Systematic Naming The IUPAC rules. Steps: Find the longest chain.
5 rganic Chemistry Interactive Notes by Groups attached to the parent chain are called substituents and are named based on the number of carbons in the longest chain of that substituent, and are numbered using the number of the carbon atom on the parent chain to which they are attached. If the same substituent occurs more than once in a molecule, the number of each carbon of the parent chain where the substituent occurs is given and a multiplier is used to indicate the total number of identical substituents; i.e., dimethyl... trimethyl... tetraethyl..., etc. Numbering of the carbons in the parent chain is always done in the direction that gives the lowest number to the substituent which is encountered first, or, the lowest number at the first point of difference. If there are different substituents at equivalent positions on the chain, the substituent of lower alphabetical order is given the lowest number. In constructing the name, substituents are arranged in alphabetical order, without regard for multipliers. When these descriptors are used in an IUPAC name, iso is alphabetized normally; the hyphenated prefixes, however (sec- and tert-) are disregarded when alphabetizing. A more systematic method for the nomenclature of side-chains involves identifying the longest chain in the substituent, numbering the substituent from the point of attachment to the parent, and indicating side-chains on the substituent using the standard method described for simple alkanes. The name is enclosed in parenthesis to indicate that the numbering corresponds to the local side-chain, not the parent chain. Thus: an isopropyl side-chain can also be named (1-methylethyl), a sec-butyl side-chain can also be named (1-methylpropyl), an isopentyl side-chain can also be named (3-methylbutyl), etc.
6 rganic Chemistry Interactive Notes by The origin of the prefixes sec- and tert-, given above, rests with an attempt to describe the nature of the branched carbon unit. By definition, a primary carbon is one which is attached to one other carbon atom, a secondary carbon is one which is attached to two, a tertiary carbon is attached to three, and a quaternary carbon is attached to four other carbon atoms; these are often abbreviated as 1, 2, 3 and 4 carbons. Figures and much description above from Practice: Name these C 6 14 isomeric alkanes. The Nitty Gritty Test yourself on this example 3 C C 3 C 1 C 2 C C 2 C C C 2 C 2 C C C -ethyl- -isopropyl- -methylundecane Now consider what is the best name. 3 C 1 C 2 C 2 C C 2 C C 2 C C2 4 6 C 3 C 7 C sec-butyl- -isopropylnonane r 3 C 1 C 2 C 2 C C 2 C C 2 C C2 4 6 C 3 C 7 C ethyl-, -dimethyl- -propylnonane
7 Practice C 3 C 3 C C 2 C C C C 2 C C 2 rganic Chemistry Interactive Notes by jim.maxka@nau.edu 2 C C 2 3 C C 2 C 2 isopropylcyclohexane or 3 C C 2 C C 2 C C 2 2 C C 2 C 2 C 2 3 C Fine Points of Alphebetization CASE 1 alphebetizing with no IUPAC substituents 4-ethyl-3,3-dimethylhexane Do not alphabetize di Ethyl before methyl Draw: CASE 2 alphabetizing inside an IUPAC substituent 5-(1-ethyl-1,2-dimethylpropyl)nonane Do not alphabetize di Ethyl before methyl Draw: CASE 3 alphabetizing between IUPAC and simple substituents 3-(1,1-dimethylethyl)-4-ethylheptane Alphabetize on di it is the first letter of the IUPAC substituent Draw
8 rganic Chemistry Interactive Notes by Petroleum Distillation A complete story of petroleum distillation can be read at the ow Stuff works web site: Another good source written for chemical engineers can be found at. Which Fraction to Make? Various fractions are more important at different times of year. During the summer driving months, the public consumes vast amounts of gasoline, whereas during the winter more fuel oil is consumed. These demands also vary depending upon whether you live in the frigid north, or the humid south. Modern refineries are able to alter the ratios of the different fractions to meet demand, and maximize profit.
9 rganic Chemistry Interactive Notes by Fractions btained from Crude ils Fraction Carbon chains Boiling range ( o C) % of crude oil Natural Gas C 1 to C 4 Below 20 10% Petroleum ether (solvent) C 5 to C 6 30 to 60 10% Naphtha (solvent) C 7 to C 8 60 to 90 10% Gasoline C 6 to C to % Kerosene C 12 to C to % Fuel oils, mineral oil C 15 to C to % Lubricating oil, petroleum jelly, greases, paraffin C 16 to C 24 ver % wax, asphalt The outcome of burning hydrocarbons. ydrocarbons are burned for heat and gas expansion (ICE). Burning anything in the presence of oxygen is called. The general reaction looks like this: Complete combustion C x y + 2 x C 2 + y/2 2 + heat Assuming the hydrocarbon is octane, 15 gallons (avg tank of gas) burned completely in air makes about 350 lbs of C gal (3.8L/gal) (0.7kg/L) (1000g/kg) (1mole/114g) (8molesC 2 /1moleC 8 18 ) (44g/mole)(1kg/1000g)(2.2#/kg) = 270 lbs. Incomplete combustion: C x y + 2 x C + y/2 2 + heat ow do we deal with the C? What is the reaction of burning coal? What are pollution problems from burning coal? What is the most desirable combustion reaction from an environmental point of view? What is the octane number? Some of the saturated hydrocarbons between C 6 and C 12 burn well and some don t. In general, the straight chain hydrocarbons burn poorly with lots of soot. Increasing the branching of the hydrocarbons, increases the reactivity and makes the burning more efficient. n the octane scale: C 2 C 2 C 2 3 C C 2 C 2 C2 = 0 C 3 C C C 2 = 100 The ICE needs high octane fuel to avoid afterburning or knocking. The diesel engine does best with poorer octane fuel because heat not a spark is what ignites the fuel. See Can you see the key to burning efficiency in organic structure? (VERY IMPRTANT for the course)
10 rganic Chemistry Interactive Notes by Gas Chromatography Applications Gasoline The most common hydrocarbon analysis carried out by GC is probably that of gasoline. The analysis of gasoline is typical of the type of sample for which GC is the ideal technique. It is this type of multicomponent mixtures containing very similar compounds that need the high efficiencies available from GC for a successful analysis. The separation of a sample of gasoline carried out on a long open tubular column is shown in figure 35. It is clear that the column had a very high efficiency which was claimed to be in excess of 400,000 theoretical plates. The column was 100 m long and only 250 mm I.D., carrying a film of the stationary phase, Petrocol D, 0.5 mm thick. Petrocol D is specially designed stationary phase for the separation of hydrocarbons and consists of bonded dimethylsiloxane, a very dispersive type of stationary phase, retaining the solutes approximately in the order of their increasing boiling points. 1. Isobutane Methylhexane 23. o Xylene 2. n Butane 13. 2,3,4 Trimethylpentane Methyl 3 ethylbenzene 3. Isopentane 14. n eptane 25. 1,3,6 Trimethylbenzene 4. n Pentane 15. 2,5 Dimethylhexane 26. 1,2,4 trimethylbenzene 5. 2,3 Dimethylbutane 16. 2,4 Dimethylhexane 27. 1,2,3 Trimethylbenzene 6. 2 Methylpentane 17. 2,3,4 Trimethylpentane 28 Naphthalene 7. 3 Methylpentane 18. Toluene Methylnaphthalene 8. n exane 19. 2,3 Dimethylhexane Methylnaphthalene 9. 2,4 Dimethylpentane 20. Ethylbenzene 31. Dimethylnaphthalene 10. Benzene 21. m Xylene Methylhexane 22. p Xylene Courtesy of Supelco Inc.
11 rganic Chemistry Interactive Notes by Cycloalkanes Name Substituent Formula Condensed formula Line formula Angles Strain Cyclopropane Cyclopropyl C 3 6 Cyclobutane Cyclobutyl C 4 8 Cyclopentane Cyclopentyl C 5 10 Cyclohexane Cyclohexyl C 6 12 Cycloheptane Cycloheptyl C 7 14 Cycloalkane Cycloalkyl C n 2n (C 2 ) n Substituted cycloalkanes have 3 naming conventions that differ from alkanes. 1. If substituted, if the substituent is large or complicated then the cycloalkane can be named as a substituent. 2. The numbering starts at a substituted ring atom. 3. The numbering of more than one substituent will depend on picking the lowest possible number combination for the substituents, with the lowest alphabetical substituent taking the lowest #. The direction may be clockwise or counterclockwise. Examples of the IUPAC Rules in Practice The following two cases provide examples of monosubstituted cycloalkanes. More highly substituted cycloalkanes are named in a similar fashion, but care must be taken in numbering the ring.
12 rganic Chemistry Interactive Notes by Cis-trans Since there can be no rotation around the sigma bonds in the ring, it is possible to have a new kind of isomer. This isomer has the same connectivity but different orientation in 3-D space. We indicate cis trans either with wedges and dashes or with a perspective-line projection technique. Consider 1,2-Dimethylcyclohexane trans- opposite sides cis -- same side trans- opposite sides cis -- same side Unsaturation or DI (ydrogen Deficiency Index) C n 2n. Loss of hydrogen content is called unsaturation. Any time a ring is made, the structure loses 2 s. You also lose 2 h s when you make a double bond. Formulas for saturated hydrocarbons are C n 2n+2. ne unsaturation would give a formula C n 2n. Consider this example: C 2 Propane C 2 Cyclopropane 2 C C 2 You can see the relationship between the two structures like this. * * 2 C C 2 C 2 2 C Use charts like these if in doubt. For C 6 6 C 8 12 C 7 12 Formula DI Formula DI Formula DI C C C C C C C C C C C C Examples: C 2 C 2 Draw all of the isomers of C 5 10 (no alkenes).
13 Draw all of the cis-trans isomers of Dimethylcyclopropane rganic Chemistry Interactive Notes by Dimethylcyclobutane Dimethylcyclopentane Summaries 1. Continue to review functional groups. Use flash cards. 2. Be able to identify functional groups. 3. Memorize the simple alkane names. Use flashcards. 4. Understand trends in physical properties of simple alkanes. 5. Know how to draw and recognize condensed structures. 6. Know how to draw and recognize line structures. 7. Know how to go in between line, condensed and Lewis structures. 8. Find the longest chain of an alkane. 9. Identify the substituents. 10. Construct a name with proper prefix numbers and alphabetical order. 11. Be able to name an alkane with common and IUPAC substituents. 12. Be able to draw alkanes from names. 13. Identify 1º, 2º, 3º, 4º carbons in an organic molecule. 14. Know how to draw all the isomers from a formula. 15. Know how to analyze a combustion reaction. 16. Know how to calculate degrees of unsaturation or DI. 17. Know how to draw cycloalkanes from names. 18. Know how to name cycloalkanes from structures. 19. Be able to recognize cis/trans from cycloalkanes. 20. Be able draw cis and trans structures of cycloalkanes from names.
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