1. Cyclohexyne has been proposed as a reactive intermediate in some organic reac
ID: 1003908 • Letter: 1
Question
1. Cyclohexyne has been proposed as a reactive intermediate in some organic reactions, but it is not a stable compound that can be isolated and stored. Provide a brief explanation to explain why cyclohexyne is not stable enough to isolate and store. 2. Select the letters of all the true statements about 3-hexyne and write in the space below. (A) 3-Hexyne contains one pi cloud above the central c ca bond and one pi cloud below the central C-C bond. (B) 3-Hexyne is a terminal alkyne. (C) The pi orbitals (each containing two electrons) of e are perpendicular to one another. (D) 3-Hexyne will react with the base, NaNH ketone. (E) 3- Hexyne reacts with dilute aqueous H2sou to give only one (F) 3-Hexyne has stereoisomers. (G) 3-Hexyne should be extremely soluble in water. 3. Provide a name for the following compound. CH 4. For reaction below, indicate whether a syn or anti mechanism of addition occurs. If the reaction is not stereoselective, write "NS" (A) Palladium catalyzed hydrogenation of cyclohexene. (B) chlorination ofcyclopentene with Cl2. (c) Hydroboration of 2,2-dimethylcyclohexene with BHain THF. (D) Epoxidation of cyclooctene with MCPBA. (E) Addition of HBr to trans-2-butene. BONus (5 point maximum). Show the structures of the products obtained when vitamin D2 (below) is subjected to ozonolysis followed by reduction of the ozonide with Zn in acetic acid. HC HC HOExplanation / Answer
1. Cyclohexyne has triple bond, where the triple bonded carbons are sp hybridized,
And we know sp hybrid carbons have tendency to attain plannarity or linearity, so they tends to become linear, but in cyclohexyne ring they can't be linear.
Hence they have a lot of strain as a result they are unstable
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