Question

Essential Oils H.CO H3CO HO anethole from anise seed cinnamaldehyde from cinammon bark eugenol from cloves 1118 (+)-carvone from carroway seed (-)-carvone from spearmint

Find chiraliy centers in all five and identify either R or S , E or Z . identify them as disatereomers or enantiomers

Answer 1

Answer:

I - H3COOⓇ No Configurational Isomerism Geometrical Isomerism is possible as there is unsymmetrical C=C bond On the basis of Cahn-ngold-Prelog rule, Priority order is given to substituents on olefinic C. As equally prior groups are on opposite side, its trans of E geometrical Isomer. b) ☺ ☺ O=0, No Configurational Isomerism Geometrical Isomerism is possible as there is unsymmetrical C=C bond On the basis of Cahn-Ingold-Prelog rule, Priority order is given to substituents on olefinic C. As equally prior groups are on opposite side, its trans of E geometrical Isomer. I-O. Me -I HOV No Configurational Isomerism as no chiral centre present. No Geometric al Isomerism is possible as there is no unsymmetrical C=C bond

CH3 esame (S) } C- - Hence highest prior equivalent to a mano de C C Then, bonded to C=O hence more prior to ! Hence the given priority. CH2 In (d) by observing chiral C we get (R) configuration but as lowest prior group is not away from observer hence (R) changes to (S) In(e) its (R) only. These are enantiomers. as there is only one chiral centre.

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