Double 1,3-dipolar cycloaddition of 2,6-bis(Arylmethylidene)cyclohexanones: A novel entry into the synthesis of 2 ',6 '-bis-spiro(1-N-methyl-4-aryl- pyrrolidine)cyclohexanones

2-6-Bis(Arylmethylidene)cyclohexanones undergo double 1,3-dipolar cycloaddition reaction with azomethine ylide derived from paraformaldehyde and sarcosine to give bis-spiro-pyrrolidines in good yield. The structures of which were established by different spectroscopic techniques.