sodium borohydride lab - Carlos Caceres Chem Lab Olivia Lee...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Carlos Caceres Chem Lab Olivia Lee 10/23/09 The Sodium Borohydride Reduction of Benzil and Benzoin Performed 10/16/09 Purpose To reduce Benzil and Benzoin with sodium borohydride and determining the purity of the product through the analysis of melting point ranges. Results Mine: Product: white crystals Product Melting Point: 125.4-126.2 ° C Melting Point with Benzoin: 114.2 – 115.8 ° C Percent Yield: Katherine Hu: Product: White crystals Product Melting Point: 122.8-124.9 ° C Melting Point with Benzoin: 108.8-114.5 ° C Mixed Product Melting Point: 122.9-127.1 ° C Discussion When benzoin is reduced, several stereoisomeric products are formed. The possible isomers are the meso compound, the (1R, 2R) enantiomer, and the (1S, 2S) enantiomer seen below. Of these three, the meso form is the most favored when reducing benzoin because the other two isomers generate steric hindrance from the nearby hydroxy group.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
When reducing benzil. it is a stepwise reaction because the only way it could be concerted would be if all 3 of the acting molecules interacted at the same spot, at the
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

sodium borohydride lab - Carlos Caceres Chem Lab Olivia Lee...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online