Stereocenter - Study guides, Class notes & Summaries

UMICH CHEM 210 - Exam #3 - Reaction Mechanisms 100% Correct SN1 Reaction - ANSWER- Unimolecular nucleophilic substitution - 2 steps - Starting with enantiomerically pure product tends to result in some degree of racemization - Retention AND inversion at stereocenter (R and S) - 1 nucleophile is replaced by another nucleophile - Carbocation INTERMEDIATE forms - Rate is dependent only on substrate concentration 1. LG leaves, forming a carbocation 2. Nucleophile attacks the carbocati...

Basicity rules correct answers -strong base: unstable/reactive (ED groups) -weak base: stable (EW groups/more EN/bigger) Chair conformation correct answers -more stable equitorial (slanted) -pointing up/pointing down=cis if both up -elimination: trans and diaxial Newman projection correct answers -gauche: substituent groups adjacent to eachother -grab middle and turn to put in plane Enantiomers correct answers -not superimposable mirror images -same besides stereochemistry Diast...

Chem 219 Unit 3 Exam Questions With 100% Correct Answers Stereochemistry the study of the three-dimensional structure of molecules Stereoisomers Compounds with the same structural formula and connectivity but with a different 3D arrangement of the atoms in space. Enantiomers Stereoisomers that that are non-superimposable mirror images. Enantiomers have the same connectivity but different orientations (twist) of the four atoms or groups in 3D space. The two different forms of the chira...

Chem 219 Unit 3 Exam Questions With 100% Correct Answers Stereochemistry the study of the three-dimensional structure of molecules Stereoisomers Compounds with the same structural formula and connectivity but with a different 3D arrangement of the atoms in space. Enantiomers Stereoisomers that that are non-superimposable mirror images. Enantiomers have the same connectivity but different orientations (twist) of the four atoms or groups in 3D space. The two different forms of the chira...

SN1 Reaction - ANSWER- Unimolecular nucleophilic substitution - 2 steps - Starting with enantiomerically pure product tends to result in some degree of racemization - Retention AND inversion at stereocenter (R and S) - 1 nucleophile is replaced by another nucleophile - Carbocation INTERMEDIATE forms - Rate is dependent only on substrate concentration 1. LG leaves, forming a carbocation 2. Nucleophile attacks the carbocation, forming the product SN2 Reaction - ANSWER- Bimolecular nuc...

CHEM&219 Unit 3 Nomenclature Exam Questions With 100% Correct Answers 2024 What is R/S nomenclature used for? - answerNaming each enantiomer of an enantiomer pair of a chiral molecule What is E/Z nomenclature used for? - answerUsed for determining and naming the cis- or trans- nature of a substituted alkene. R/S Nomenclature of Enantiomers - answerThe system used to name enantiomeric forms of a chiral molecule is known as the R/S system or the Cahn-Ingold-Prelog(CIP) system (after its de...

CHEM&219 Unit 3 Nomenclature Exam Questions With 100% Correct Answers 2024 What is R/S nomenclature used for? - answerNaming each enantiomer of an enantiomer pair of a chiral molecule What is E/Z nomenclature used for? - answerUsed for determining and naming the cis- or trans- nature of a substituted alkene. R/S Nomenclature of Enantiomers - answerThe system used to name enantiomeric forms of a chiral molecule is known as the R/S system or the Cahn-Ingold-Prelog(CIP) system (after its de...

CHEM&219 Unit 3 Nomenclature Exam Questions With 100% Correct Answers 2024 What is R/S nomenclature used for? - answerNaming each enantiomer of an enantiomer pair of a chiral molecule What is E/Z nomenclature used for? - answerUsed for determining and naming the cis- or trans- nature of a substituted alkene. R/S Nomenclature of Enantiomers - answerThe system used to name enantiomeric forms of a chiral molecule is known as the R/S system or the Cahn-Ingold-Prelog(CIP) system (after its de...

CHEM&219 Unit 3 Nomenclature Exam with Correct Solutions What is R/S nomenclature used for? - Answer -Naming each enantiomer of an enantiomer pair of a chiral molecule What is E/Z nomenclature used for? - Answer -Used for determining and naming the cis- or trans- nature of a substituted alkene. R/S Nomenclature of Enantiomers - Answer -The system used to name enantiomeric forms of a chiral molecule is known as the R/S system or the Cahn-Ingold-Prelog(CIP) system (after its developers). Th...

What is the general formula for a carbohydrate? - Answer Cx(H2O)y How do you determine the number of stereoisomers for a given carbohydrate? - Answer 2^n where n= number of stereocenters Distinguish between the D and L designations for carbohydrates. - Answer In the L form the hydroxy group is on the bottom left closest to the CH2OH group in the frame of a Fischer projection In the D form the OH is on the bottom right What are anomers? - Answer Diastereomers formed by the cyclization of c...