Hydrazinolysis of methyl 2-ethoxybenzoate with hydrazine hydrate was first carried out to obtain 2-methoxybenzol hydrazine(1); hydrazinolysis was then performed between ethyl butyrimidate hydrochloride and 1 to produce 2-ethoxy-N′-(1-iminobutyl)benzohydrazide hydrochloride(3); 3 was finally cyclized with chloroacetone to give 4.

Potassium maleate-containing ionomers were prepared by ring-opening reaction of epoxidized styrene-butadiene-styrene block copolymer(SBS).

Epoxidized styrene-butadiene-styrene triblock copolymer(ESBS) can react with potassium hydrogen maleate by ring-opening reaction in the presence of phase transfer catalyst and ring-opening catalyst.

Sodium sulfonated SBS ionomer was made from epoxidized styrene-butadienestyrene triblock copolymer(ESBS) and NaHSO_3 by ring-opening reaction in the presence of phase transfer catalyst,ring-opening catalyst and pH value regulator.

The present work use a new-type anode, lead dioxde membrane electrode,for electron-chemically oxidizing calcium lignosulfonate, and discuss the effects of pH value, electrolysisvoltage and charge amount on aromaic ring-opening reaction of lignin during the process of elec-tro-oxidation, Some conclusions are obtained from the results.

Ab initio study on the ring opening reactions of cyclopropymethanide and cyclobutylmethanide;

Their ring opening reactions can be used for preparing polyfunctional or other cyclic compounds.

This article reviews the ring opening reaction of five membered nitrogen containing heterocyclic compounds.