The Pyrolysis of Esters 2419 of the starting material) melting at 100.5-100.7°alone and when mixed with the original material. Summary 1. cis-1,2-Dimethylcyclopentanediol-l ,2 undergoes the pinacol rearrangement with migration of a methyl group and production of 2,2-dimethylcyclopentanone.2. trans -1,2 -Dimethylcyclopentanediof-1,2 when boiled with dilute aqueous acid undergoes resinification. It has not been possible to char-acterize any product from this reaction. It is suggested that dehydration without rearrangement is here occurring, yielding a product which is rapidly polymerized by the acid.3. These observations confirm the conclusion previously reached that in the pinacol rearrangement elimination of a hydroxyl group and the arrival of a migrating radical occur on opposite sides of the same carbon atom.Cambridge, Mass.

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Diphenylketene and phenylmagnesium bromide react1 to produce a derivative of triphenylvinyl alcohol. With ketene2 itself, the course of the Grignard reaction has not been established because of the vigor and complexity of the process. Toward the dimer of dimethylketene, ethylmagnesium bromide3 adds to give the cyclic glycol in high yields (CH3)2C-CO CO-¿(CH,)j 2EtMgBr (CH3)2C-CEt-OH HO-CEt-¿(CH3)2

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