Carbon-13 NMR Spectra of 1,3-Dioxolanes. I-New Parameters for cis- and trans-4-Methyl Groups in 2,4-Disubstituted Derivatives

Article abstract of DOI:10.1002/mrc.1260240904

The 13C NMR spectra of 24 1,3-dioxolane derivatives are reported in an attempt to propose parameters for the C-2, C-4 and C-5 shifts from the 2-Me and 4-Me substituents, based on the ring stereochemistry.These parameters are obtained from simultaneuos equations, and clearly agree with those calculated by the use of pattern molecules.The calculated parameter for the C-4 shift due to a 2-Me group differs notably from that proposed by other workers.KEY WORDS 1,3-dioxolane derivatives 13C NMR Shift parameters