Talk:Sigmatropic reaction

σ-bond could use a link. - first one is linked to sigma bond.
designation is not simple. - done
Link Greek to Greek language. - done
Link shift to wiktionary. - done
being added is passive. - done
simultaneous is not simple. - link
metal should be linked. - done
notation is not simple. - link
backbone needs a link. - done
concisely is not simple. - delete
Sigmatropic rearrangements are concisely described by an order term [i,j], which is defined as the migration of a σ-bond adjacent to one or more π systems to a new position (i-1) and (j-1) atoms removed from the original location of the σ-bond. is clearly too long. - done
even number needs a link. - done
indication needs a link. - done
involvement needs a link. - fixed
chain needs a link. - done
odd number needs a link. - done
charged linking. - done
heteroatoms needs linking. - done once
preserving symmetry considerations link, rephrase or something. - link
omitted is not simple. - link
A way to find the order of a given sigmatropic rearrangement is to give numbers to each atom starting with the atoms of the bond being broken as atom 1. is too long. - done
The numbers that correspond to the atoms forming the new bond are then separated by a comma and placed within brackets to create the sigmatropic reaction order descriptor. too long and as some complex words. - done
Link **migration. - already linked in "overview" section
attained is not simple. - link
designation is not simple. - done
occur is not simple. - link
retention or inversion is not simple. - done
In cases of stereochemical retention, the migrating group translates without rotation into the bonding position, while in the case of stereochemical inversion the migrating group both rotates and translates to reach its bonded conformation. is too long. - done
However, another stereochemical transition effect equally capable of producing inversion or retention products is whether the migrating group remains on the original face of the π system after rebonding or instead transfers to the opposite face of the π system. is too long. - done
Although such a shift is symmetry allowed, the Mobius topology required in the transition state prohibits such a shift because it is geometrically impossible, which accounts for the fact that enols do not isomerize without an acid or base catalyst. is too long. - done
Here the geometry of the transition state is prohibitive, but an alkyl group, due to the nature of its orbitals, can invert its geometry, form a new bond with the back lobe of its sp3 orbital, and therefore proceed via a suprafacial shift. is fairly complex at all. - done
These reactions are still not common in open chain systems because of the highly ordered nature of the transition state, which is more readily achieved in cyclic molecules. also fairly long and complex. - done
Photochemical [1,3] shifts should proceed through suprafacial shifts; however, most are non-concerted because they proceed through a triplet state (i.e., have a diradical mechanism, to which the Woodward-Hoffmann rules do not apply). too long/complex. - done
˚C should be linked. - done
predicted link to predict. - done
suprafacially is not simple. - Yes, but I explained and defined the term at the start of the discussion.
studies have, however, been done is passive. - done
Alkyl groups undergo [1,5] shifts very poorly, usually requiring high temperatures, however, for cyclohexadienes, the temperature for alkyl shifts isn’t much higher than that for carbonyls, the best migratory group. is fairly long and uses an abbreviation. - removed contraction and broke up.
previtamin needs a link. - done
nonatrienes is not simple. - link
irreversible needs a link. - done
accompanied is not simple. - done
have been used successfully is passive language. - done
divalent is not simple. - linked twice
clockwise and anticlockwise are also in the article and should be linked. - done

I think that's it for now. -Barras (talk) 22:01, 30 August 2011 (UTC)[reply]