Electrochemistry
- Who Wants To Be A Heterocyclic Millionaire?
In case you didn't know, Phil has been teaching a Heterocyclic Chemistry class here at Scripps since 2005. This course consists of approximately two dozen 1.5-hour lectures. Other than the students, there are many Scripps postdocs and industrial chemists...
- [shortcut] Determine No. Of Paired/ Unpaired E– In A Species E.g. Te+
← Back to Atomic Structure Determine total e– count of the species. If electron count is less than 18, it is faster to just write out the electronic configuration. If electron count is more than 18, subtract e– count by 18, 36 or 54; the largest...
- Predict/ Account For Physical Properties
← Back to Chemical Bonding Approach: Determine the type of substance (metal/ ionic/ covalent) and structure (giant metallic/ giant ionic/ giant covalent/ simple molecular) Determine bonding relevant to property Focus on that particular column...
- Reactions
← Back to Organic Chemistry Problem-Solving Approach There are 4 types of questions: Given reactants + products → suggest reagents and conditions Given reactants + reagents → suggest products Given new reaction (Grignard, Killiani-Fishcer,...
- Chemical Bonding
Overview * Covalent bonds are also present in simple molecular structures. However, they are not broken during physical reactions (e.g. boiling, melting) For questions related to Chemical Bonding: Determine the type of substance (metal/...
Electrochemistry
Determine no. of Stereoisomers
← Back to Intro to Org Chem
| no. of stereoisomers = 2n |
- n = no. of stereogenic centers i.e. chiral C + C=C or cyclic rings that can exhibit cis/trans
- Students make mistakes when they blindly count the total number of C=C
- Note that C=C within a cyclic ring cannot exhibit cis-trans
How to (Quickly) Identify Chiral Carbons
- Ignore C with multiple bonds - they have less than 4 neighbours
- Ignore C in benzene rings - benzene C have only 3 neighbours
- Ignore ‘V-shaped C’ - they are bonded to 2H (same groups)
- Look for C with ‘peace’ or ‘claw’ shape
- Check if there are 4 different groups on each of these C
How to check if a C in a cyclic ring has different groups?
Example:
| APPROACH
|
- Check groups 1 & 2:
not symmetrical → groups 1 & 3 are different
- Check groups 1 & 3:
not symmetrical → groups 1 & 3 are different
- Check groups 2 & 3:
not symmetrical → groups 2 & 3 are different
all 4 groups are different → C is chiral
- Who Wants To Be A Heterocyclic Millionaire?
In case you didn't know, Phil has been teaching a Heterocyclic Chemistry class here at Scripps since 2005. This course consists of approximately two dozen 1.5-hour lectures. Other than the students, there are many Scripps postdocs and industrial chemists...
- [shortcut] Determine No. Of Paired/ Unpaired E– In A Species E.g. Te+
← Back to Atomic Structure Determine total e– count of the species. If electron count is less than 18, it is faster to just write out the electronic configuration. If electron count is more than 18, subtract e– count by 18, 36 or 54; the largest...
- Predict/ Account For Physical Properties
← Back to Chemical Bonding Approach: Determine the type of substance (metal/ ionic/ covalent) and structure (giant metallic/ giant ionic/ giant covalent/ simple molecular) Determine bonding relevant to property Focus on that particular column...
- Reactions
← Back to Organic Chemistry Problem-Solving Approach There are 4 types of questions: Given reactants + products → suggest reagents and conditions Given reactants + reagents → suggest products Given new reaction (Grignard, Killiani-Fishcer,...
- Chemical Bonding
Overview * Covalent bonds are also present in simple molecular structures. However, they are not broken during physical reactions (e.g. boiling, melting) For questions related to Chemical Bonding: Determine the type of substance (metal/...