three-membered


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Adj.1.three-membered - of a chemical compound having a ring with three membersthree-membered - of a chemical compound having a ring with three members
membered - having members; normally used in chemistry in combination with a number
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Optimized geometries, vibrational frequencies, and thermochemical properties of mixed boron-and nitrogen-containing three-membered rings.
The chapters are not comprehensive reviews, but personal accounts, and cover 1,2-migrations, 1,2-migrations via three-membered rings, 1,3-transpositions, [3,3]-and [2,3]-sigmatropic rearrangements, and IPSO rearrangements.
McKee [24] considered several structures for the S[O.sub.4] species and predicted that the lowest-energy structure is to have a three-membered SOO ring and [C.sub.2v] symmetry.