Advices For Studying Organic Chemistry

iii) Finally, enzymatic removal of a proton from C9 forms the C8-C9 double bond

leading to lanosterol.

CH 3

H 3 C

CH 3

CH 3

H 3 C

CH 3

CH 3

HO H

H

H

CH (^318)
(^1317)
14
8
10 9
5
Protosteryl cation
B
CH 3
CH 3
CH 3
H
H
CH 3
CH 3
CH 3
CH 3
3 C
HO^9814
10 13 17
18
Lanosterol

5. The remaining steps to cholesterol involve loss of three carbons through 19
   oxidation-reduction steps:

H

H 3 C

HC H 3 C

19

3

H 3 C

HO CH

3 Lanosterol

CH (^3) H
Cholesterol

6. the basis of the same fundamental principles and

8.16 SU

Summ

CH 3

HO

steps H H

Biosynthetic reactions occur on

reaction pathways in organic chemistry.

MMARY OF KEY REACTIONS

ary of Addition Reactions of Alkenes