(a) Provide a curved arrow mechanism for the reaction shown below, commenting on the stereochemical outcome. Aco Aco AcO- AcO- OAC PhSH, BF3 OEt2 CH₂Cl₂ ACO ACO ACO ACO Ho ŠPh Major product (b) Which spectroscopic technique would you use to determine the stereochemistry at the anomeric centre of a sugar? Describe what

Draw the major product(s) of the following reactions, if there is a reaction. Be sure to include stereochemistry in your products. H30* 3 l2 NaOH но OH H30* 1. LDA, THF 2.

Predict the major products of the following reaction. Be sure to use wedge and dash bonds to show the stereochemistry of the products when it's important, for example to distinguish between two different major products.

A(n) A(n) H₂N- H | O || H₂N -CICIO _ HO ||| H Glycine OH OH OH T CH₂-C-CH₂ H Glycerol H O H H CH₂ Glycylalanine C-N-C + H₂N- C-O HO T || CICIO CH₂ Alanine reaction converts glycylalanine to glycine and alanine. This reaction requires OH O OH I I CH₂-C-CH₂ Dihydroxyacetone reaction converts glycerol to dihydroxyacetone. This reaction requires and also produces