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The deficiency was remedied by isomer- ization (changing molecular structure) of
the more abundant normal butane into isobutane. The isomerization catalyst is
aluminum chloride supported on alumina, promoted by hydrogen chloride gas.
Diethyl methyl-«-propylmalo- mepro- nate is reduced with lithium aluminum
hydride, LiAlH4, bamate to the corresponding dihydric primary alcohol; this is
condensed with carbonyl chloride, COC12, with elimination of hydrogen chloride
to give ...
Sulfur bacteria, which use hydrogen sulfide as a source of hydrogen atoms
instead of water, produce sulfur instead of oxygen during photosynthesis. In the
1930s, a Dutch biologist, Cornelis van Niel, recognized that the utilization of
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review
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For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review