eclipsed conformation

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eclipsed conformation

[i′klipst ‚kän·fər′mā·shən]
(physical chemistry)
A particular arrangement of constituent atoms that may rotate about a single bond in a molecule; for ethane it is such that when viewed along the axis of the carbon-carbon bond the hydrogen atoms of one methyl group are exactly in line with those of the other methyl group.
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When Pophristic blocked the electron jumping by placing a hypothetical screen between the two methyl groups, ethane's structure finally assumed the eclipsed form, she and Goodman report in the May 31 NATURE.