- What is the meaning of n-Pr and i-Pr? - Chemistry Stack Exchange
Propyl is a simple hydrocarbon with three carbons in it Propane is $\ce{CH3CH2CH3}$ Propyl is the unit formed by attaching that chain to something else (which implies replacing one of the carbons with another bond)
- What is the formally correct notation of t-Bu, i-Pr, p-NO2, n-Bu, a-HCl . . .
In the current version of Nomenclature of Organic Chemistry – IUPAC Recommendations and Preferred Names 2013 (Blue Book), single italic lower-case Latin letters are used in some stereodescriptors (such as ‘c’, ‘m’, ‘p’, ‘r’, ‘s’, and ‘t’), in descriptors for fusion sites (e g dibenzo[c,g]phenanthrene), in locants (‘o’, ‘m’, and ‘p’ in place of ortho, meta
- nomenclature - What are the practices to naming organic chemicals by . . .
According to the 2008 IUPAC recommendations (see Table II on page 406), the structural abbreviations Me, Et, Pr, iPr, Bu, iBu, s-Bu, t-Bu, Ac, Ph, Ms, Ts, and Cp may be used freely without further explanation Other structural abbreviations may be used if they are accompanied by a clear explanation (e g a graphical representation) of the
- Which has higher priority according to Cahn-Ingold-Prelog priority . . .
For sBu and iPr this is easy The Roman numerals I, II, III, IV refer to the "spheres" that are talked about in the Blue Book, which denote the distance from the stereogenic centre Generally, this "distance" refers to the number of bonds: so Sphere I is one bond away from the stereogenic centre, and so on
- organic chemistry - Newman projections: how to tell which groups are . . .
The scenario Let's say we have a molecule where in the Newman projection the front carbon has a hydrogen, methyl and an ethyl, and in the back carbon there's a hydrogen, something like a S, Cl or Br (bigger than carbon but only one atom), and something like another ethyl or isopropyl:
- Reaction of cyclohexene oxide with LDA - Chemistry Stack Exchange
Because of the steric hindrance of the two iPr groups, LDA is a very poor nucleophile It is, as you note, a very strong base The two products observed both arise from deprotonation of cyclohexene oxide Deprotonation of one of the methylenes alpha to the epoxide ring opens it to give the allylic alcohol
- nomenclature - Is the i prefix for iso- italicised? - Chemistry . . .
See in particular Table II on page 406, which gives the following forms: iPr, iBu, s-Bu, and t-Bu (which is in line with the Blue Book) It says that if you choose these abbreviations, then explicitly defining them is unnecessary
- organic chemistry - Relationship between thermodynamics and steric . . .
I am investigating reactions with alkyl-substituted amines ($\ce{R} = \ce{Me}, \ce{Et}, \ce{^iPr}, \ce{^tBu}$) and a second reagent, in which product Z is formed $\Delta G$ for all of these transformations is negative When the amine substituent is large ($\ce{R} = \ce{^tBu}$), only product Z is formed
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