The Preparation of Orthoesters 1825 the importance of the steric factor. This was also pointed out by Preckel and Selwood.4 Another point which should be emphasized is that there is a difference in the diand tetra-substituted /3-naphthyl derivatives (6 and 13%), whereas in the alkyl substituted compounds in this general series these differences between diand tetra-substituted compounds were not found.1 However, the hexa-substituted derivatives in the alkyl and aryl series all seem to fall in about the same range (25-35%). From the data of Gomberg and Schoepfle7 it seems likely that our 0.1 M solutions of di--naphthyltetraphenylethane were supersaturated.All of the aryl-substituted ethanes except tetrap-biphenyldiphenylethane were relatively stable as indicated by the constant value for their magnetic susceptibilities over twenty-four hour periods. Tetra-p-biphenyldiphenylethane solutions deposited heavy white crystalline precipitates in twenty-four hours. ' Hexa-/3-naphthyle thane showed a decrease in color and a change in magnetic susceptibility on exposure to diffused daylight over a period of one week.
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