Question

can someone help me on this question:

predict the products of the reactions of excited state carbonyl compounds with alkenes (following parteno - b u chi reaction)

thanks a lot

Answer 1

We will take 3 cases here for this one reaction. Parteno-buchi reaction is a reaction between an excited carbonyl compound & alkene in presence of light to give oxetone. (1) R - ER & IR hy This a simple case free radical formation I place which gives the product. In the next will get the or how product forms based on radical stability takes case, you free Lt R In this case me get the products. free radical formation takes ploce which more unstable or Less stable 72 reclical (less stable) gives product → R-c- R- C - R z radical (more stable) Less unstable or more stable due to time alkyl groups attached This is a rule that two unstable rodical always reat just. Therefore this is the major, product.

hv - H Less stable (Major) more stable more stable + Less stable - C CH2 H (major) react first. Two unstable radical