Base values R alkyl or ring residue R入=246nm REH 入=250nn R=OH, OR 入=230nm Increment for each substituent Alkyl or ring residue 3 10 -OH-OR o,m 25 O o m 20 o m 0 10 -Br o,m NH 2 o,m 13 58 NHC(O)CH3 o m 20 NHCH3 N(CH3)2 o,m 85
Base values : R = alkyl or ring residue l = 246 nm R = H l = 250 nm R = OH, OR l = 230 nm Increment for each substituent : -Alkyl or ring residue o,m 3 p 10 -OH, -OR o,m 7 p 25 - O - o,m 11 p 20 -Cl o,m 0 p 10 -Br o,m 2 p 15 -NH 2 o,m 13 p 58 -NHC(O)CH 3 o,m 20 p 45 -NHCH 3 p 73 -N(CH 3 ) 2 o,m 20 p 85
HO HO OH Parent chromophore 230nm p-OH: 25 nm m-OH 27=14nm Calculated 269nm observed 270nm
Parent chromophore: 230 nm p-OH: 25 nm m-OH: 2 x 7 = 14 nm Calculated: 269 nm Observed: 270 nm
Parent chromophore 246nm o-Ring residue: 3 nm m-Bra 2nm Calculated 251nm observed 253nm
Parent chromophore: 246 nm o-Ring residue: 3 nm m-Br: 2 nm Calculated: 251 nm Observed: 253 nm