From: invalid@kmitko.at.list.dot.pl   
      
   On 30 Jul 2018, muttaz83@gmail.com wrote   
   (in article):   
      
   > On Friday, June 11, 1993 at 9:16:46 AM UTC+10, Neal Howard wrote:   
   > > > Answer for (2): Cyclohexane is *relatively* unreactive compared to all   
   the   
   > > > other compounds in an intro organic chem text :) because its bonds (C-C   
   and   
   > > > C-H) have little or no dipole moments, and most reactions depend on   
   > > > interactions between positive/negative charges or charge asymmetries.   
   > > > However, cyclohexanes DO undergo one reaction easily --- they burn!   
   > >   
   > > ... and I have a question about the burning of cyclohexane, anybody know   
   > > what the comparative octane rating (research number) of cyclohexane is?   
   > > I've got a couple of textbooks which list various straight, branched, and   
   > > aromatic hydrocarbons' octane numbers (i.e n-heptane = 25   
   > > n-hexane = 65   
   > > ...   
   > > ...   
   > > iso-octane = 100 (reference)   
   > > benzene = 106   
   > > toluene = 120   
   > > racemic xylene = 126)   
   > > but there is no mention of cyclohexane. Also is cyclohexane more expensive   
   > > than toluene when purchased a couple gallons at a time? Last summer, I   
   found   
   > > almost a gallon of benzene in an old machine shop building and used it as   
   > > octane booster in my motorcycle and it worked pretty well. I've used small   
   > > amounts of toluene (berryman chemtool) but I'm a little leary of dissolving   
   > > the neoprene in the fuel lines and carburetor internals with too much   
   > > toluene (or xylene). The benzene was almost perfect as an octane booster   
   and   
   > > didn't attack neoprene nearly as much as toluene or xylene do. Could   
   > > cyclohexane be the miracle spooge I'm looking for or is it too expensive or   
   > > does it's fuel performance in a piston engine suck?   
   > Can I please know how the date of this post goes back to 1993 when google was   
   > founded in 1998.   
      
   Because this group was created before the Google and is not owned by it.   
   It’s so-called “Usenet”. Usenet is a network of independent servers,   
   each of which provides public access to topical groups, such as sci.chem.   
   Usenet is something fundamentally different than web pages, it predates the   
   world wide web by a decade. Back in the 1990s there was a company called   
   Deja, which decided they should provide web-based access to the Usenet and   
   archived a lot of old messages. Some time after, Deja was bought by Google,   
   which renamed it to “Google Groups” and added some Google-only forums.   
   The Usenet, however, is still there: right now I’m using a dedicated usenet   
   app (not a web browser) to post a message to a server run by a phone company   
   in Poland. Google will pull this message and put it on their “Google   
   Groups” page, where you can read it.   
      
   --   
   Chemical engineers do it in packed beds.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)