I tie iporitaneous f o r m a t i o n of a n i n s o~i~e , infii-il>lv 1,utacliene popcorn pol?;mer ha$ been encountered i n c o~i i t . o f Lhe commercial clibtillation u n i t s w h i c h are ic-etl t o purify butadiene for the s?;nthetir r u b b e r proprani. On( t' initiated, the p o l > m e r Shows a logarithmic pro\+ t h i t i b u t a d i e n e monomer and has caused fouling and etet] hurstiiig of large scale distillation e q u i p m e n t i n relatit el? short times. h l t h o u g h it can be initiated in n %ariety of w a y s , iron and a c t i t e oxygen play a11 i m p o r t a n t p a r t i r i its formation. Its growth is retarded b u t n o t t e r m i n a t e d by ~ulcanization accelerators, n hereas c.on\eritional ' i n t ioxidants have little effect.
Boron or silicon fluoride dissolved in an alcohol forms with mercuric oxide a catalyst for acetylene reactions much superior to sulfuric acid.2. Fluoboric and fluosilicic acids are probably the active constituents of these solutions, which have high electrical conductance and strong acid properties (Fig. 1).3. Boron fluoride dissolved in ether to form BF3(C2H5)20, b. p. 123°m ay also be used as a catalytic agent.4. The catalysts are effective in very small quantities. 5. Using these catalysts, ethylidene ethers have been prepared from glycols, hydroxy acids and their derivatives by the acetylene method.6. A number of these compounds have not previously been prepared and could not be made by any known methods from acetylene or from acetaldehyde.Notre Dame, Indiana
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