CHEM 239 Lecture 8: Enols and Enolates 2

Complete the following "road-map" by giving the structures of the intermediates (A-Q) and the ructure ot the product tetrahydrofuran-2-ylmethyl furan-2-carboxylate. 11,0. , Δ PDC 3) H,O Bら D NBS, hy ELO 2)258, Δ i major l 1) NBS h H SO, (ao) 0H ietralivoroiuran2-vimenvi furan-2-carooxviai Cl

1) Consider the molecular orbital diagram for ammonia, NH, (see lecture 5) Describe the PES spectrum for NH, and explain how it is consistent with the MO diagram for NHs? Qualitatively predict the PES for H2O and BeHz (see below for MO diagrams). i. ii. Assessed via the associated Moodle submission (requiring a single pdf file to be uploaded), opening Wednesday week 19 (12noon), closing Friday week 19 (5pm). 2) Consider the molecular orbital diagrams shown below for linear BeH, and V-shaped H.O. M0 Diagram for Beh, 2~eeee) Be2s O-イ H LCAOs Be AOs @t. -o oonanV MO s BeH2 MO:s 2b H LCAOs MO Diagram for HyO a1 O 2p 1b bonding MOs O 2s O AOs H20 MOs Draw the corresponding Walsh diagram to illustrate how the relative energies of the molecular orbitals varies as the geometry changes from linear to bent i. ii, Explain the significant change in the energy of the 1o, (BeH,)-1b, (H,0) orbital, and the significant change in energy of one of the 1n, (BeH) orbitals-2a, (H-0) orbital, as a function of geometry ii. Predict the geometry of BH iv. Predict the geometry of NH,

Prove the solution to wave equation with dispersion on a normal domain Ohm R^3 is unique. Specifically, show u_tt = - gamma^2 u + nabla^2 u + F(x, t), x elementof Ohm, t > 0, u|_ partial differential Ohm = 0, t > 0, u(x, o) = f(x), x elementof Ohm, u_t (x,0) = g(x), x elementof Ohm has a unique solution in the class of functions in C^2(Ohm^-, [0, infinity)).