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We have applied single determinant ab initio molecular orbital theory to the description of internal rotation in vinylcyclopropane and vinylcyclobutane. Using the minimal STO-3G basis we find the two molecules to be most stable in their s-trans forms but also predict both to possess flat secondary s-cis and gauche minima. Further investigation on vinylcyclopropane with the extended 4-31G basis set confirms the gauche minimum but places doubt on the stability of the s-cis structure. Substitution on the vinyl group in vinylcyclopropane by -

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The electrochemical reactions associated with the lower discharge plateau of Li/FeS2 cells are controlled by mass transport in the solid phase.The electrochemical reaction associated with the upper discharge plateau of Li/FeS2 cells is controlled by mass transport in the molten salt.Higher power output and lower internal resistance are facilitated by agitating the molten salt and making the positive electrode of small FeS2 particles.

in the SDS gel) probably extend through the S~-A. In any case, the S~-A layer represents a significant anion-depleted (cation-rich) zone just below the surface of the membrane.