Non-empirical calculations of NMR indirect carbon-carbon coupling constants. Part 7--spiroalkanes

Carbon-carbon spin-spin coupling constants were calculated at the SOPPA level for a series of seven classical spiroalkanes, spiro2.2]pentane, spiro2.3]hexane, spiro2.4]heptane, spiro2.5]octane, spiro3.3]heptane, spiro4.4]nonane and spiro5.5]undecane, with special focus upon couplings involving and/or across spiro carbons. Many interesting structural trends were investigated originating in specific geometries and unusual bonding environments at the spiro carbon.