A new free-radical initiator, azobisisobutanol diacetate, has been prepared from azobisisobutyronitrile in good yield in three steps: ( 1 ) methanolysis to convert the nitrile groups to ester functions; (2) reduction of the diester to a diol; and (3) acetylation, Thus, it is more easily synthesized than other azo compounds having similar free-radical-generating properties and may be easily tagged with Cl4 if desired. Steady production of free radicals at 167" was demonstrated.

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Dicyclohexylphosphine and diphenylphosphine react with 1,2-dichlorohexafluorocyclopentene to give almost exclusively the monoderivative via displacement of a vinylic chlorine atom. With the former phosphine a disubstituted derivative is also found. In addition to analytical values and infrared spectroscopic data, both I9F and 31P nuclear magnetic resonance spectra support the proposed structures.

Examines evidence for the correct structure of dicyandiamide.

A B S T R A C T T h e reaction o f methoxide ion with perfluorocyclopentene gave two major components. These have been identified as 1-fluoro-2-methoxyhexaAuorocyclopentene ( I I f ) and 1,2-dimethoxyhexafluorocyclopentene (IIe).A third component (3-methoxy-2,4,4,5,5-pentaAuoro-2-cyclopenten-l-one ( V I I ) ) was isoIated and a structure is proposed based on n.m.r. evidence.A list o f carbon-carbon double bond stretch frequencies is given for a number of 1,2-disubstituted perfluorocycloper~ter~es which follow the electronegativities o f the atoms adjacent t o the double bond.