MO/VB Theory
For homonuclear diatomics, a sigma/pi energy level switch take place (between which two elements?)
What is between nitrogen and oxygen?
To determine chirality, we do this when element #4 is in the plane of the page
What is switch #4 with the element in the back, then count 3,2,1?
This information will be provided to you on midterm #2
What is the NMR chemical shift predictions handout (as needed)?
This element is present when the M+2 peak is 4% the intensity of M
What is sulfur?
This must happen in order for nitrogen with three bonds (and one lone pair) to be sp2 hybridized
What is conjugation/a conjugated pi system?
For heteronuclear diatomic MO diagrams, this element (of the two) always has lower energy
What is the more electronegative element?
When comparing molecular pairs, this pair exhibits a change of one or more chiral centers from R to S or S to R, but not all
What is a pair of diastereomers?
The quantification of interaction between two atoms
What is the J(-coupling) value?
Equation for determining the number of C atoms from a proton NMR
What is (M+1/M)/.011?
This is the most stable position for a substituent on a cyclohexane chair
What is equatorial?
These electrons participate in bonding and should be depicted as such on an MO diagram
What are valence electrons?
These have a different name even after removing cis-, trans-, E/Z, R/S prefixes
What are constitutional isomers?
Used to determine the ratio of hydrogens that correspond to the signal
Mass spectroscopy can't give us direct information about this element, although it frequently appears in organic molecules.
What is oxygen?
This handout will NOT be provided on midterm 2
What is the nomenclature rules handout?
This calculation can give us information about the type of bond between two atoms in an MO diagram (single, double, triple bond?)
What is bond order calculation?
You are allowed to bring this (tangible) item with you to midterm #2
The number of signals in a 13C NMR gives us this information
What is the minimum number of C present?
True or false: the molecular ion peak is always the most intense peak on a mass spectrum
What is false?
Acidic functional group
What is phenol, thiol, carboxylic acid, or sulfonic acid?
This type of orbital extends over more than one atom
What is a molecular orbital?
All horizontal bonds in this type of molecular drawing are slanted out of the page
What is a Fischer projection?
The dissociation of energetically unstable molecular ions formed from passing molecules in the ionization chamber (gives rise to unique patterns in mass spec)
What is fragmentation?
Units on the x-axis of a mass spectrum
What is mass/charge?
For nomenclature, when a carbon chain becomes a substituent, we do this