lec_2 - LEC TWO ESTABLISHING ORGANIC STRUCTURES DATA...

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Unformatted text preview: LEC TWO ESTABLISHING ORGANIC STRUCTURES DATA LIMITATIONS USES OF MOLECULAR FORMULA OR PARTIAL FORMULA Unsaturation Number (UN) Hydrogen Deficiency Index (HDI) C n H 2n+2 ref. point ADD H FOR EACH X ADD CH FOR EACH N OR P OR H FOR EACH N OR P EXAMPLES UN = 1 C 6 H 12 O EVEN H COUNT C 6 H 12 C 6 H 11 Cl ODD H COUNT Cl---H C 6 H 12 C 6 H 13 N ODD H COUNT N---CH C 7 H 14 C 6 H 14 N 2 EVEN H COUNT N 2---C 2 H 2 C 8 H 16 What is the Unsaturation Number? C 16 H 18 N 4 Br 2 Cl 2 SO 2 N 4 --- C 4 H 4 Br 2 --- H 2 Cl 2--- H 2 S O 2 C 20 H 26 42-26/2 = 8 FOR THE IMMEDIATE FUTURE HOW MANY STRUCTURES FIT C 2 H 3 O 2 Cl ? P 8 BEGIN HERE UN = [(2a+2) (b-d+e)] 2 C 2 H 3 O 2 Cl = (4+2)-3-1 2 = 1 C a H b O c N d X e NOW THE QUESTION HOW MANY STRUCTURES FIT C 2 H 3 O 2 Cl CLASS VOTE HERE TA VOTE HERE 7 STABLE 4 OR MORE UNSTABLE P 8 BEGIN HERE C 2 H 3 O 2 Cl = 7 STABLE & 4 UNSTABLE STRUCTURES FCN GPS: C=C OR C=O OR RING; C-O-Z; C-Cl C 2 H 3 O 2 Cl ACYCLIC H C 2 H 3 O 2 Cl CYCLIC SUMMARY C 2 H 3 O 2 Cl H Cl P 8 BEGIN HERE see pg 12-N-CH 3 A. CASE WHERE LIST OF SUB STRUCTURES IS CLEAR ?...
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This note was uploaded on 08/06/2008 for the course CHEM 124 taught by Professor Amagata during the Winter '08 term at UCSB.

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lec_2 - LEC TWO ESTABLISHING ORGANIC STRUCTURES DATA...

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