N- H2NOH H* H3C CH3 H3C Hydroxylamine reacts with 2,4-pentanedione to yield 3,5-dimethylisoxazole. Including protonations and...

 

 

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N- H2NOH H* H3C CH3 H3C Hydroxylamine reacts with 2,4-pentanedione to yield 3,5-dimethylisoxazole. Including protonations and deprotonations, the reaction takes 12 steps. Write out the mechanism on a sheet of paper and then draw the structure of the product of step 8. You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading. • In an elimination step, include the structure of the leaving group, but draw it in its own sketcher. Separate structures with + signs from the drop-down menu. When galactose is treated with NaBH, reaction occurs to yield dulcitol, a polyalcohol commonly used as a food additive. Draw curved arrows to show the movement of electrons in this step of the reaction mechanism. B-A CH,ÖH H- OH H- HO- Но H- HO -H- A: HO -H- Но- H- H- OH H- ČH2OH CH2OH Draw the structure of butanedial in the window below. • Show stereochemistry only if given in the name. • Include H atoms at chiral centers only. • Ifa group is achiral, do not use wedged or hashed bonds on it. • Do not include lone pairs in your answer. They will not be considered grading. N- H2NOH H* H3C CH3 H3C Hydroxylamine reacts with 2,4-pentanedione to yield 3,5-dimethylisoxazole. Including protonations and deprotonations, the reaction takes 12 steps. Write out the mechanism on a sheet of paper and then draw the structure of the product of step 8. You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading. • In an elimination step, include the structure of the leaving group, but draw it in its own sketcher. Separate structures with + signs from the drop-down menu. When galactose is treated with NaBH, reaction occurs to yield dulcitol, a polyalcohol commonly used as a food additive. Draw curved arrows to show the movement of electrons in this step of the reaction mechanism. B-A CH,ÖH H- OH H- HO- Но H- HO -H- A: HO -H- Но- H- H- OH H- ČH2OH CH2OH Draw the structure of butanedial in the window below. • Show stereochemistry only if given in the name. • Include H atoms at chiral centers only. • Ifa group is achiral, do not use wedged or hashed bonds on it. • Do not include lone pairs in your answer. They will not be considered grading.

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