Let's break down the reaction step by step: ## **Step 1: Analyzing the Starting Material** The starting material is a chiral alcohol: - It is a 2-pentanol derivative with the OH group **on a wedge** (meaning it's coming out of the plane). ## **Step 2: Reagents** - **(CH₃CH₂)₃SiCl** is triethylsilyl chloride (TESCl), a common protecting group for alcohols. - **Et₃N** is triethylamine, a base used to neutralize HCl formed during the reaction. ## **Step 3: The Reaction** This is a **silylation reaction**, where the alcohol is converted into a silyl ether. The **OH group** will be replaced with an **O–Si(CH₂CH₃)₃** group (TES ether). **The stereochemistry at the carbon does NOT change** during this protection step: the O-TES group will be on the wedge, just like the original OH. --- ## **Major Product Structure** Replace the OH with O–Si(CH₂CH₃)₃ (**TES group**) on the same wedge: ### **Product Drawing** ``` | | ----C----CH2CH3 | CH3–CH–CH2–O–Si(CH2CH3)3 | (Wedge to OTES) ``` Or more simply, the product is: - The same carbon skeleton, - The wedge now shows **O–Si(CH₂CH₃)₃** instead of OH. --- ### **Summary Table** | Reactant | Reagent | Product (Major) | |-------------------------------|----------------------------------|----------------------------------------| | Chiral alcohol (OH on wedge) | (CH₃CH₂)₃SiCl, Et₃N | O–Si(CH₂CH₃)₃ (TES) on wedge | --- ## **Key Points** - This is a **protection** reaction for alcohols. - The stereochemistry at the chiral center **does not change**. - The OH group is replaced by O–Si(CH₂CH₃)₃ (TES). If you want a drawing, let me know and I can describe it more visually!