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CH 3

CH 3. CH 3. CH 3. CH 3. CH. C. CH. CH. C. CH. CH. CH. CH. CH 3. CH 3. CH. CH. CH. CH. CH. C. CH. C. CH. CH 3. CH 3. CH 3. CH 3. beta – carotene . Cis – retinal . CH 3. H. CH 3. H. H. H. H. H. CH 3. 3 HC. 3 HC. C ═ O. H. Trans – retinal . O ║ C . H.

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CH 3

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  1. CH3 CH3 CH3 CH3 CH C CH CH C CH CH CH CH CH3 CH3 CH CH CH CH CH C CH C CH CH3 CH3 CH3 CH3 beta – carotene

  2. Cis – retinal CH3 H CH3 H H H H H CH3 3HC 3HC C ═ O H

  3. Trans – retinal O ║ C H H CH3 CH3 CH3 H H CH3 H H H 3HC

  4. ALKENE ISOMERISM

  5. CHAIN/SKELETAL STRUCTURAL POSITIONAL FUNCTIONAL ISOMERISM GEOMETRICAL STEREO CONFORMATIONAL OPTICAL

  6. Positional • Positional Isomers –Isomers that differ in the location of a noncarbon group or a double or triple bonds. Example : 2 - butene CH3 – CH ═ CH – CH3 -------------→ CH2 ═ CH – CH2 – CH3 -------------→ 1 - butene

  7. Stereoisomerism • Isomers with the same bonding attachments of atoms but different spatial orientations.

  8. Geometric • Or sometimes called cis and trans isomers – a type of stereoisomerism in which atoms or groups display orientation differences around a double bond or ring.

  9. Cis -Isomer • Geometric isomer in which groups are on the “same side”of the ring or double bond. Example : 1,2 – dichloroethene Cl Cl C ═ C H H

  10. Trans – Isomer • Geometric Isomer in which groups are on the “opposite” sides of ring or double bond. Example :1,2 - dichloroethene Cl H C ═ C Cl H

  11. Do U want to PLAY a game?

  12. Mechanics • All will be given a chance 2 answer • I will be D’ one flashing instructions on screen • Then, U will be doing Ur all, to comply with the given instructions. • U will be doing it first on Ur notebook, then if you are done U just have 2 “shout out” your name 2 class and said “I can answer that ma’am espie” • U will be given 20 seconds 2 answer on D’ board. • 3 points will be added on your quizzes or exercises for every correct answer. • Good luck everyone!!!

  13. 19 20 13 11 EXAMPLE 18 15 08 07 14 17 16 01 04 09 03 10 12 06 05 02 00 O ║ Draw the CIS and TRANS isomers of 1,2 – difluoroethene F F F H C ═ C C ═ C H F H H CIS TRANS

  14. D’ game starts Now………

  15. 19 20 13 11 18 15 08 07 14 01 17 16 12 10 09 05 04 03 06 Item # 1 02 00 O ║ Draw the CIS and TRANS isomers of the molecular formula C6H12or 3 – hexene CH3 – CH2 CH2 – CH3 H CH2 – CH3 C ═ C C ═ C H H H CH3 – CH2 CIS TRANS

  16. 19 20 13 11 18 17 16 01 15 14 07 08 03 04 05 09 06 12 10 Item # 2 00 02 O ║ Draw the structure of the given IUPAC name Cis,Cis – 3,5 – octadiene H H CH3 – CH2 C ═ C CH2 – CH3 C ═ C H H

  17. 19 20 13 11 18 15 08 07 14 01 16 17 05 10 09 12 04 03 06 Item # 3 02 00 O ║ Draw the structure of the given IUPAC name Trans,Cis,Trans – 3,4 – dibromo 7,8 – dichloro – 3,5,7 – decatriene H H Cl C ═ C Br C ═ C C ═ C Cl CH3 – CH2 CH2 – CH3 Br

  18. 19 20 13 11 18 15 08 07 14 01 17 16 12 10 09 05 04 03 06 Item # 4 02 00 O ║ Draw the CIS and TRANS isomers of the molecular formula C6H10F2 double bond is located at carbon 3 CH3 – CH2 CH2 – CH3 F CH2 – CH3 C ═ C C ═ C F F F CH3 – CH2 CIS TRANS

  19. 19 20 13 11 18 15 08 07 14 01 16 17 05 10 09 12 04 03 06 Item # 5 02 00 O ║ Draw the structure of the given IUPAC name Cis,Cis,Trans – 2,3,6,7 – tetrachloro– 2,4,6 – nonatriene H H Cl C ═ C 3HC C ═ C C ═ C Cl Cl Cl CH2 – CH3

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