Discussion on Unstability of Cyclobutadiene with the theory of HMO;

Abstract:This paper aims to use the principle of molecular symmetty to hold HMO calcula-tion to cyclobutadiene.

After themercaptan was transformed into anion by base, the subetitution nucleophilic process of butoxy of n-butyl nitrogenoxosquarate can be took place,and the thioalkyl group could be introduced into thefour carbon ring of the cyclobutendione.

Synthesis of cyclized cis-1,4-polybutadiene in-situ by Nd-based catalyst and cationic catalyst;