Using levulinic acid and phenol as raw materials, hydrochloric acid as catalyst and thioglycolic acid as assistant catalyst, the synthesis technology of diphenolic acid, a new polymer material substitution for biphenol A, was investigated.

In this paper,the progress on diphenolic acid preparation by condensation reaction of levulinic acid and phenol is introduced.

The synthesis method of hyperbranched polyester was presented based upon diphenolic acid (DPA).

Synthesis of 1-Hydroxy-2-(1-methylimidazol-2-yl) ethylidene-1,1-bisphosphonic acid;

PART 1 (1) Synthesis of [2-(6-amio-purin-9-yl)-1-hydroxy-1- hydroxyphosphinoyl -ethyl] phosphonic acid Objective: To synthetize a compound, 6-amio-purine-9 -substituted bisphosphonic acid Methods: 6-Amio-purin-9-yl-acetid acid was obtained from N-alkylysis reaction of adenine with ethyl chloroacetate and followed by acid hydrolysis.

Production technique of sodium diacetate and application;

Study on the new process for preparing sodium diacetate of the food additive;

The definitions and functions of bifidus yogurt and bifidus promoter yogurt are given, and the problems and solutions to them explained.

A brief Summary is given of the diversity of bifidus yogurt and bifidus promoter yogurt with particular reference to the importance of possible test methods.