[criss]

Dear all,
   I have several issues regarding the organic chemistry.
  First of all is 1H-phenalene aromatic? why?
  My second question is related to esterification. Is it possible to obtain an ester from an organic acid and R-OTs? how is it working?
   

[Babcock_Hall]

It is a forum rule that you must show your attempt to answer a question first before we can help you.

[criss]

I am sorry for not givena any answer. So I will take them step by step.
   On the first question the 1H-phenalene has 12 pi electrons ( not obey the 4n+2 rule) therefore i am thinking that maybe it is not aromatic, although the molecule is formed by fusing 3 benzene rings.

    On the second question if you think of -OTs the first though will be as a good leaving group, therefore a carbocation is formed. The synthesis should not work in this case.

  Hope now it is ok

[Babcock_Hall]

I only have time for a very brief response to the second question for right now.  A good leaving group does not necessarily imply that a carbocation is formed, although one might be formed.  Besides a good leaving group, what else is needed in a substitution?