jw_1_2_2 - Jeew oo L im 1-1 1[2 2 Phot ocycloadditions in...

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J ee w oo L im 1 - 1 1: [2+2] Photocycloadditions in Organic Chemistry 1. Basics - addition o f t w oa l k enes ( 2 p ie lec trons + 2 p ielectrons ) to yield a f o u r - mem b ered ring. [2 + 2] h v -light re qu ired f or the reaction ; nothing ha pp ens i f only heat is a pp lied. >S ince t w o molec u les are reacting to f orm ne w chemical b onds ,w e need interaction b et w een f illed and u n f illed or b itals. F or the thermal case ( heat stim u l u s ), the molec u lar or b itals o f the al k ene loo k sl i k ethis : LUM O ( al k ene ) H O M O ( al k ene ) >T here f ore ,w e need the electrons in the H O M Oo f one al k ene entering the LUM Oo f its reacting p artner ,w hich , in this case , is dis f a v ored d u etoaant i b onding interaction: T his ma k es A nti b onding Bonding interaction. the addition I nteraction DISFAV O RED!! >W hen light is u sed as the energy so u rce instead o f the heat , the electronic con f ig u ration o f the al k
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jw_1_2_2 - Jeew oo L im 1-1 1[2 2 Phot ocycloadditions in...

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