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Unformatted text preview: 1 Please make a model of 2-chloropentane 43 2 chloropentane while you wait (different structures with the same formula) Review : 44 stereo- isomers (different structures with the same formula but different bond connectivities) constitutional isomers (different structures with the same formula and the same bond connectivities) stereoisomers stereoisomers frequently have frequently have Review : 45 H Cl stereocenters stereocenters , , e.g. e.g. , carbon atoms , carbon atoms with four different with four different substituents substituents H Cl Review : 46 Stereoisomers that Stereoisomers that are are nonidentical nonidentical mirror images are mirror images are called called enantiomers enantiomers . Stereoisomers that are Stereoisomers that are not mirror images are not mirror images are called called diastereomers diastereomers . diastereomers enantiomers Cl H Cl H CH 3 Give the stereochemical relationship between the following molecules: 47 a) Enantiomers b) Diastereomers c) Identical d) None of the above Different compounds must Different compounds must have different have different names. names. Review : 48 (S (S )-2-chlorobutane chlorobutane (R (R )-2-chlorobutane chlorobutane 2 A H Br H Br Br Select the structures that are enantiomers of A Use a model or R and S ! B R R 49 49 Br H Br H Br 1 2 3 4 5 a) 1 & 2 b) 1 & 3 c) 2 & 4 d) 3 & 4 e) 1 & 2 & 4 f) 1 & 3 & 5 g) 2 & 4 & 5 h) 3 & 4 & 5 H Br S S S X (S (S )-2-chlorobutane chlorobutane (R (R )-2-chlorobutane chlorobutane 50 If If enantiomers enantiomers are different are different compounds, compounds, should should they they have different properties? have different properties? (S (S )-phenylalanine phenylalanine MP MP 273 273 C (R (R )-phenylalanine phenylalanine a) < 273 a) < 273 C C b) 273 b) 273 C C c) > 273 ) > 273 C C d) cant predict d) cant predict Predict the melting point of (R)-phenylalanine ? ? C C 51 (S (S )-phenylalanine phenylalanine H 2 N O OH H (R (R )-phenylalanine phenylalanine...
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- Spring '09