Abstract
A 35Cl nuclear quadrupole resonance study of 2,2,3,3-tetrachlorotetrahydropyran (I) at 77 K has revealed an anomeric shift of ca. 2·4 MHz between the chlorine atoms in the 2-position; in 2,3,3-trichlorotetrahydropyran (II), similar arguments show that the 2-chlorine takes up an axial position in the solid state.
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