Homework #19 - Bocknack CH 310M Spring 2010 Please submit...

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Bocknack CH 310M Spring 2010 UTEID: Please submit to the correct slot in the collection box outside WEL 2.212!!! Last Name: First Name: Score: Graded Homework Assignment #19 Deadline : 9:00 a.m., Friday, 4/30/10 LATE WORK WILL NOT BE ACCEPTED OR GRADED!!! This assignment is worth a total of 40 raw points. Tributyltin hydride (Bu 3 SnH) is used synthetically to reduce alkyl halides, replacing a halogen atom with hydrogen. Free-radical initiators such as Br 2 promote this reaction. A specific example is shown below: H Br + Bu 3 SnH trace Br 2 h H H + Bu 3 SnBr 1. (6 points) The initiation stage of the free-radical chain reaction mechanism is comprised of 2 steps. Initiation Step 1 is shown below. Propose a mechanism for Initiation Step 2 in the space provided. Use “fishhook” arrows to show how single electrons move in your proposed mechanistic step. 2. (6 points) The propagation stage of the free-radical chain reaction mechanism is also comprised of 2 steps. Propagation Step 2 is shown below. Propose a mechanism for Propagation Step 1 in the
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Homework #19 - Bocknack CH 310M Spring 2010 Please submit...

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