The rs Structures of Fluoromethyl, Chloromethyl Ethers, and Methyl 2-Propynyl Ether

Abstract 18O enriched samples of chloromethyl methyl ether and chloromethyl ethyl ether were prepared and their microwave spectra were measured. The rS structures of fluoromethyl methyl ether, fluoromethyl ethyl ether, chloromethyl methyl ether, chloromethyl ethyl ether, and methyl 2-propynyl ether were re-evaluated from the observed rotational constants obtained under the common constraints and assumptions on the structures of the molecules. A comparison of the rS structures was made between the five molecules and between the molecules and their related molecules.