Chapters 2 4 Chem 30A Week 4 Warm up Exercise 5 min O Thujone is the active psychotropic ingredient found in wormwood used to make absinthe How many chiral centers Provide priorities to each substituent on each chiral center Draw the enantiomer Draw a diastereomer Class Exercise 1 Cyclopropane was first prepared by reaction of 1 3 dibromopropane with sodium metal If that is true what would you predict was the product of 1 3 dibromo 2 2 bromomethyl propane with sodium metal What is the geometry of the product Draw the structure in three dimensions Chem 30A Spring 2006 Chapters 2 4 2 Formaldehyde H2C O is a common chemicals used as a preservative in biology When pure formaldehyde trimerizes to give trioxane C3H6O3 Trioxane surprisingly enough has no carbonyl groups Only one monobromo derivative of trioxane is possible bromonation reactions are when bromine replaces a hydrogen in the molecule Propose a structure that fits these data 3 Draw the ring flip for the possible chair conformations for cis 1 tert butyl 4chlorocyclohexane show both chairs and a boat conformation Which is more stable Why Draw the Newman projections Label interactions as gauche synperiplanar anti periplanar eclipsed staggered 1 3 diaxial strain where appropriate Chem 30A Spring 2006 Chapters 2 4 4 The energy diagram below describes which of the following molecules trans1 2 dimethylcyclohexane or 1 2 dichloroethane Support your answer Chem 30A Spring 2006
View Full Document
Unlocking...