3. Propose a synthesis of the target molecule below, starting from acetyene. You may use any alkyl halide, organometallic reagent, and any other reagents you need. Perform a retrosynthetic analysis and show your final forward synthesis. This problem will require you to pay attention to the stereochemical outcome of multiple steps. он + Enantiomer acetylene

synthesize the following compound starting from the given molecule. Do not skip any step, show alcohol protection and deprotection, as well as the formation of Grignard reagent.

7) Using the carbon-containing starting material(s), propose a synthesis the following retrosynthetic analysis. Provide structures for all intermediates. The carbon atoms in the product must originate from the starting material(s), but you may use as many equivalents of each starting material as you would like, and any reagent/reaction you know (note: no mechanisms are required). Br OH racemic = = + -Br

Propose an efficient synthesis for the given transformation. OH This transformation can be performed with some reagent or combination of the reagents listed below. Give the necessary reagent(s) i the correct order, as a string of letters (without spaces or punctuation, such as "EBF"). If there is more than one correct solution, provide just one answer. A Br₂, hv F 1) MeMgBr; 2) H3O+ K dilute H₂SO4 B 1); 2) H3O+ G Na, NH3 (1) L DMP or PCC 1); 2) H3O+ H MCPBA (RCO 3H) M SOCI2, pyridine D Mg, diethyl ether I 1) EtMgBr; 2) H3O+ N EtBr E H₂, Lindlar's cat. J HBr (xs), heat O 1) BH3-THF; 2) H₂O2, NaOH

Propose an efficient synthesis for the following transformation: The transformation above can be performed with some reagent or combination of the reagents listed below. Give the necessary reagent(s) in the correct order, as a string of letters (without spaces or punctuation, such as "EBF"). If there is more than one correct solution, provide just one answer. A 1) MeMgBr 2) H3O* Na2Cr207, H2SO4, H2O 1) EtMgBr 2) H3O* F dilute H2SO4 t-BUOK conc. H2SO4, heat G H TsCl, pyridine NaOEt H2, Pd

Propose a sequence of reactions to prepare the specified target compound from the indicated starting materials.  All of the carbon atoms in the target must originate in the specified starting materials.  Keeping this restriction in mind, you may use any other organic or inorganic reagents necessary to complete the synthesis. It is only necessary to show the overall transformations involved in your proposed synthesis.

please help with this question. thank you. Propose a mechanism for this transformation

Propose an efficient synthesis for the following transformation. The transformation above can be performed with some reagent or combination of the reagents listed below. Give the necessary reagent(s) in the correct order, as a string of letters (without spaces or punctuation, such as "EBF"). If there is more than one correct solution, provide just one answer. B HBr conc. H,SO4, heat HC#CNa D. HBr, ROOR H2, Lindlar's cat. 1) O: 2) DMS t-BUOK dilute H,SO. H2. Pt

Give typed explanation