From: gay@sfu.ca   
      
   joshipura@gmail.com wrote:   
      
   > Hello,   
   >   
   > I am no chemist. So, apology in advance for anything nonsense posted   
   > here.   
   >   
   > However, while discussing IUPAC naming with my high school junior son,   
   > I came across this idea, which is conceivable, may not always be   
   > possible.   
   >   
   > Quickest imagination is two Benzene rings passing through each other.   
   > Behavior of this molecule may be significantly different from two   
   > Benzene rings. The idea can be extended to any two or more cyclical   
   > molecules. To make the matter worse, we can think of any entanglement   
   > of various rings, not necessary a linear chain. It may end up in   
   > meta-catanation of rings.   
   >   
   > It isn't exactly an stereoisomer of Benzene/cyclo-alkane because it is   
   > an isomer of *two* (or more) molecules instead of one.   
   >  (I hope you are with me so far.)   
   >   
   > Question 1: How are such chemicals named?   
   > Question 2: What do you call such a condition?   
   > Question 3: Are such chemicals known?   
   >   
   > Thanks in advance,   
   > -Bhushit   
      
   See wikipedia article on "catenane". It won't happen with any ring as   
   small as benzene.   
      
   Ian   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)