8A2009lecture6

8A2009lecture6 - Reminder of Quiz Dates Lecture 6 Organic Chemistry Brief 8A Quiz DATES Monday April 20 Wednesday May 6 Monday June 1

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Lecture 6 Organic Chemistry Brief 8A Reminder of Quiz Dates! • Quiz DATES: Monday April 20 Wednesday May 6 Monday June 1 Workshop/Review Sessions-- Before Exam • Dr. David, Rm. 172 Chem Thursday, 5:30-6:30 • Ms. Schirle: Mondays 10:30-11:30 Rm. 1480A (Chem Annex). Office hours to follow in Room.1480 • Dr. David’s office hours next week (4/22) will be canceled. I will hold my workshop/help session on 4/23 as listed in syllabus. Peer Tutor Workshops • Tuesdays – 12-1 Room 161 (Chemistry) – 6-7 Room 161(Chemistry) • Thursday – 12-1 Room 161 (Chemistry) – 2-3 Room 1480A (Chem. Annex) • Fridays – 11-12 Room 161 (Chemistry) – 4-5 Room 1480A (Chemistry Annex)
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Cyclohexane: Most widely seen in nature Cyclohexane is not flat! H H H H H H H H H H H H Axial Equatorial -Most stable conformation is the chair -Bond angles ideal to Td so no ring strain -No clashes of Hs -different sides of the ring-- Up/down not the same as Axial/Equatorial The Chair Conformation of Cyclohexane Ring Flip: Cyclohexane rapidly interconverts at RT Axial becomes equatorial Equatorial becomes axial
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Conformers of Cyclohexane Substituents affect stability of conformers 1, 3-diaxial interactions-- reduced stability --favors equatorial position of substituent Cis and Trans Stereoisomers in Cyclohexanes
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Ring flip doesn’t change cis/trans…. Br
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This note was uploaded on 05/07/2009 for the course CHE 66010 taught by Professor Sheiladavid during the Spring '09 term at UC Davis.

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8A2009lecture6 - Reminder of Quiz Dates Lecture 6 Organic Chemistry Brief 8A Quiz DATES Monday April 20 Wednesday May 6 Monday June 1

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