Amigo
3) α-cleavage is a very important fragmentation pathway for molecules with heteroatoms. Explainthe fragmentation pathway for the following molecules: Acetone, butanone, N-ethyl-N-methyl-propanamine (C6H15N), methyl propyl ether, diethyl ether, ethylisopropylthioether (extra credit). Usethe Chemistry Web Book to get the EI spectra (http://webbook.nist.gov/chemistry/). 4) Cleavage of the benzylic bond in phenylalkanes. Molecular ions containing aromatic rings are stable dueto the charge-stabilizing properties of aromatic rings. Explain the fragmentation pathway of the following molecules: n-propylbenzene and toluene. What is the origin of the signal at m/z 91, socommon in the EI spectra of phenylalkanes? Use the Chemistry Web Book to get the EI spectra (http://webbook.nist.gov/chemistry/). 5) In a molecular ion of straight chain such an n-alkanethere is not preferred position to localize the charge, and the primary step of dissociation is unspecific σ-bond cleavage. Compare the EI spectra of the isomers n-decane and 2,7-dimethyl octane.Use the Chemistry Web Book to get the EI spectra (http://webbook.nist.gov/chemistry/). 6. Explain with two examples the McLafferty rearrangement. Who is McLafferty? Is he still alive?
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