Abstract A new method is presented for the assignment of the NMR resonances of the diastereotopic protons in tetrahydrofur-furyl and pyrrolidinylmethyl groups, based on the conformational transmission effect This effect describes the conformational changes produced by an increase of coordination from four to five of a phosphorus, silicon or germanium atom attached to the tetrahydrofurfuryl or pyrrolidinylmethyl moieties. The 1 H ...