Homoannular Heteroannular CiSoid (transoid 1=214nm Parent 1=253nm F217(acyclic) Increments for Double bond extending conjugation 30 30 Alkyl substituent or ring residue Exocyclic double bond Polar groupings OC(O)CH3 OR Cl.-Br nR2 SR 30 30
Homoannular (cisoid) Heteroannular (transoid) Parent l=253 nm l=214 nm =217 (acyclic) Increments for: Double bond extending conjugation 30 30 Alkyl substituent or ring residue 5 5 Exocyclic double bond 5 5 Polar groupings: -OC(O)CH3 0 0 -OR 6 6 -Cl, -Br 5 5 -NR2 60 60 -SR 30 30
Example 1: Transoid 217nm Alkyl groups or ring residues: 3x 5 15 nm Calculated 232nm Observed 234nm
Example 1: Transoid: 217 nm Alkyl groups or ring residues: 3 x 5 = 15 nm Calculated: 232 nm Observed: 234 nm
Example 2 soid 253nm Alkyl groups or ring residues: 2X 5= 10 nm Calculated 263nm Observed 256nm
Cisoid: 253 nm Alkyl groups or ring residues: 2 x 5 = 10 nm Calculated: 263 nm Observed: 256 nm Example 2:
Example3: Transoid 214nm Alkyl groups ring residues: 3 5- 15 nm Exocyclic double bond n Calculated 234nm Observed 235nm
Transoid: 214 nm Alkyl groups ring residues: 3 x 5 = 15 nm Exocyclic double bond: 5 nm Calculated: 234 nm Observed: 235 nm Example3:
Example 4: Cisoid 253nm Alkyl groups/ ring residues: 4x 5 20 nm Exocyclic double bond 5nm Calculated 278nm Observed 275nm
Cisoid: 253 nm Alkyl groups / ring residues: 4 x 5 = 20 nm Exocyclic double bond: 5 nm Calculated: 278 nm Observed: 275 nm Example 4: