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  2. Sulfur dioxide - Wikipedia

    en.wikipedia.org/wiki/Sulfur_dioxide

    The Lewis structure of sulfur dioxide (SO2), showing unshared electron pairs. Spacefill model of sulfur dioxide: ... EC Number: 231-195-2; E number: E220 (preservatives)

  3. VSEPR theory - Wikipedia

    en.wikipedia.org/wiki/VSEPR_theory

    [1]: 410–417 The total number of X and E is known as the steric number. For example in a molecule AX 3 E 2, the atom A has a steric number of 5. When the substituent (X) atoms are not all the same, the geometry is still approximately valid, but the bond angles may be slightly different from the ones where all the outside atoms are the same.

  4. Molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Molecular_geometry

    This constraint removes one degree of freedom from the choices of (originally) six free bond angles to leave only five choices of bond angles. (The angles θ 11, θ 22, θ 33, and θ 44 are always zero and that this relationship can be modified for a different number of peripheral atoms by expanding/contracting the square matrix.)

  5. Sterimol parameter - Wikipedia

    en.wikipedia.org/wiki/Sterimol_parameter

    Sterimol parameters are built upon the Corey-Pauling-Koltun atomic models, which take into consideration the Van der Waals radii of each atom in the molecule. Unlike most other steric parameters such as A-value, Taft parameters and Tolman cone angle, which group all the spatial information into a single cumulative value, Sterimol parameters consist of three sub-parameters: one length parameter ...

  6. Steric effects - Wikipedia

    en.wikipedia.org/wiki/Steric_effects

    Regioselective dimethoxytritylation of the primary 5'-hydroxyl group of thymidine in the presence of a free secondary 3'-hydroxy group as a result of steric hindrance due to the dimethoxytrityl group and the ribose ring (Py = pyridine). [2] Steric hindrance is a consequence of steric effects. Steric hindrance is the slowing of chemical ...

  7. Taft equation - Wikipedia

    en.wikipedia.org/wiki/Taft_equation

    In addition to Taft's steric parameter E s, other steric parameters that are independent of kinetic data have been defined. Charton has defined values v that are derived from van der Waals radii . [ 9 ] [ 10 ] Using molecular mechanics , Meyers has defined V a values that are derived from the volume of the portion of the substituent that is ...

  8. AOL Mail for Verizon Customers - AOL Help

    help.aol.com/products/aol-mail-verizon

    AOL Mail welcomes Verizon customers to our safe and delightful email experience!

  9. Stereoelectronic effect - Wikipedia

    en.wikipedia.org/wiki/Stereoelectronic_effect

    The stereoelectronic effect, which is the interaction shown above when the acceptor orbital is the σ*(Si–CH 3), appears to be a more predominant factor in determining the reaction selectivity against the steric hindrance and even wins over the penalty of the disrupted conjugation system of the product due to steric clash. [23]