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determined previously by Long et al.11 The order tensor elements have been computed by setting r23 to a value of 2.4785 the microwave value for fluorobenzene and 2.481 for the remaining halobenzenes.Our recent determination of the signs of the order parameters of the laurate amphiphile by carbon-13 shielding anisotropy measurements indicates that the long axis of the surfactant is perpendicular to the applied field direction (see ref 25). These results are not consistent with a cylindrical superstructure for the potassium laurate type II nematic phase oriented perpendicular to the applied field. The order tensor elements for the halobenzenes show that the C2v symmetry axis is also on the average perpendicular to the applied field and coincident with the long (25) R. C.

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The effects of the leaving group X‐CO‐O‐, the stabilization of the remaining positive charge by SiMe3 and its stereo position, and the substituent R on the rates of elimination of X‐CO‐O‐SiMe3 from (I) to form (II) are studied in detail.