Synthese und NMR‐Spektren einiger ¹³C‐markierter Thio‐ und Seleno‐äther, ‐acetale und ‐orthoester

Abstract

Synthesis and NMR Spectra of Some 13 C‐Labelled Thio‐ and Seleno‐ethers, ‐acetals, and ‐orthoesters Twenty‐seven different open‐chain and cyclic derivatives (RX) n CH 4‐ n and (RX) n CH 3‐ n R′ with n = 1−3, X = S or Se, R,R′ = alkyl or aryl, 1,3,5‐trithiane, and bis‐(dimethylsulfonio)methane and ‐methanide with single or multiple 13 C‐labelling have been synthesized. The 13 C‐NMR spectra of the sulfur and selenim compounds have been measured, and the dependence of the chemical shifts (δ c ) and coupling constants [′ J (C,H), ′ J (Se,C)] from the substitution pattern in discussed ( Fig. 1 ) and compared with the polyhalogeno‐methanes ( Fig. 2 ).