Test 11 Photochemistry Solution

Test 11 Photochemistry Solution has solved practice problems related to topics Norrish type I, Norrish type II and Paterno Buchi reaction.

Norrish Type I Reaction

Solution

first step: primary process regioselective cleavage of C-C bond alpha to carbonyl carbon generating stable radical

second step: inversion followed by radical recombination is seen as a secondary process

Study concept here Norrish Type I reaction

Solution

first step: primary process regioselective cleavage of C-C bond alpha to carbonyl carbon generating stable radical

second step: secondary process

  • decarbonylation dominates if reaction is in vapor phase
  • proton abstraction dominates if reaction is carried in liquid phase
Study concept here Norrish Type I reaction

Solution

first step: primary process regioselective cleavage of C-C bond alpha to carbonyl carbon generating stable radical

step 2: delocalisation of radical and joining to form five member ring

Study concept here Norrish Type I reaction

Solution

first step: primary process regioselective cleavage of C-C bond alpha to carbonyl carbon generating stable radical

step 2: opening strained ring to give stable radical and followed by ring expansion

Study concept here Norrish Type I reaction

Norrish Type II Reaction

Solution

first step: carbonyl carbon abstracting gamma H to form 1,4 biradical intermediate

second step: beta cleavage generating olefin and carbonyl compound

Study concept here Norrish Type II reaction

Solution

first step: carbonyl carbon abstracting gamma H to form 1,4 biradical intermediate

second step: cyclization to give six and four member ring products

Study concept here Norrish Type II reaction

Solution

first step: carbonyl carbon abstracting gamma H to form 1,4 biradical intermediate

second step: cyclization to give four member ring products

Study concept here Norrish Type II reaction

Paterno Buchi reaction

Solution intermolecular photocyclo addition of carbonyl compounds and alkynes

Paterno buchi reaction

Solution

intermolecular photocyclo addition of carbonyl compounds and allenes

Paterno buchi reaction

Solution

intramolecular photocyclo addition of carbonyl compounds and alkenes

Paterno buchi reaction

Also read Test 10 Photochemistry solution

FURTHER READING ORGANIC PHOTOCHEMISTRY

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