159The ozonolysis of oleic acid or methyl oleate in a carboxylic acid medium produces three major peroxidic species as well as aldehyde. These peroxidic compounds have been identified as 1-acyloxyalkyl-l-hydroperoxides, 1,2,4-trioxolanes, and bis{1-acyloxy-l-alkyl) peroxides. The bis(1acyloxy-l-alkyl) peroxides have not been reported previously as oleic acid or methyl oleate ozonolysis products. A 1H nuclear magnetic resonance examination of the ozonization products of oleic acid or methyl oleate in carboxylic adds, as well as methanol and iso-octane, led to the identification of the peroxidic compounds and aldehyde.
Aus Hydroxy‐tosyloxy‐iodbenzol (I) und Cyclohexen (II) erhält man das cis‐l ,2‐Bis‐tosyloxy‐cyclohexan (III), das auch aus dem freien Diol (IV) gewonnen werden kann.
Various terminal alkynes have been found to react with [hydroxy(tosyloxy)iodo]benzene (4) in CHC13 to give either aryl [ß-(tosyloxy) vinyl] iodonium tosylates 5 or alkynylaryliodonium tosylates 6 or a mixture of the two. The product composition is subject to steric control. Among the «-branched alkyl groups R in RC=CH, the isopropyl group seems to define the steric median: those alkynes with R larger than isopropyl (i.e., R = t-Bu, sec-Bu, cyclohexyl) give only alkynylaryliodonium tosylates while those alkynes with R smaller than isopropyl give only aryl [d-(tosyloxy)vinyl]iodonium tosylates. 3-Methyl-l-butyne and 4-methyl-l-pentyne (/3-branching) give a mixture of 5 and 6. (Trimethylsilyl)acetylene reacts with 4 in a different way; the trimethylsilyl group is cleaved from the alkyne, and phenyl[/3-(tosyloxy)vinyl]iodonium tosylate is obtained.
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