Reaction of chiral 2-iodooctane with sec-butyllithium in petroleum ether at " 70 �C followed by reaction with dry ice yielded mostly racemic 2-methylbutyric acid but also an amount of optically active 2-methyloctanoic acid which could only have formed from likewise optical active 2-methylheptyllithium with the carbon atom linked to lithium the carbanion:
32.
Some collectors of used stamps have discovered that although not readily removable by water, the self-adhesives can be removed with Bestine ( a hexane solvent ), Benzine ( Petroleum Ether ), or a natural based citrus solvent containing d-limonene ( e . g ., Pure Citrus Orange is an air freshener product that works for this purpose ).
33.
Within three years he received a patent titled Pyrophorous Lighter, ( U . S . Pat . 1, 084, 386 ) which we now appreciate as the Paragon striker lighter, a simple device capable of producing and sustaining a flame by means of a steel-tipped wand fitted with a cloth-wick saturated in petroleum ether also known as Benzine or Naphtha.
34.
:" Petroleum ether is obtained from petroleum refineries as the portion of the distillate which is intermediate between the lighter naphtha and the heavier kerosene " says the PE article, while Naphtha says it is referred to as PE . My guess is that naphtha is not the same, but that there is a blurred boundary .-" Talk ) 01 : 00, 10 March 2008 ( UTC)
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