CHARGE CONTROL OF THE COMPLEX-FORMATION OF PHENOL WITH UNSATURATED-COMPOUNDS CONTAINING ORGANOELEMENT SUBSTITUENTS FROM GROUP-IV .8. FURAN-DERIVATIVES

The frequency shifts (Delta v (OH)) of phenol and the resonance compon ents (Delta v(R)) of these shifts in the IR spectra of forty H-complex es of phenol with furan derivatives containing organic, organosilicon, organogermanium, and organotin substituents are studied. The values o f Delta v and Delta v(R) are linearly related to quantum chemical para meters of the variation of the effective charges of the furan ring ato ms affected by sigma- and pi-interactions with organic substituents. T he effect of the conjugation between an organoelement substituent and the furan ring on the effective charges is estimated. The resonance pa rameters (sigma(R)) of organoelement substituents in derivatives of be nzene, thiophene, and furan and the reasons for the non-versatility of sigma(R) are considered.