| 摘要 |
NEW MATERIAL:A compound of the formula (m is 0, 1; R is H, methyl; the positions of the substituents are o-, m- and p-positions in the aromatic ring). EXAMPLE:m-Xylyleneditiol diacrylate. USE:It is used in optical parts. The compound is thermally homopolymerized or copolymerized together with unsaturated carboxylic acid esters such as diethylene glycol dimethacrylate, or ethylene glycol dimethacrylate to give a sulfur-containing acrylic or methacrylic resin of high refractive index, as maintaining high Abbe index, compared with conventional resins. PREPARATION:Esterification reaction between o-xylylenedithiol, m- xylylenedithiol or o-benzenedithiol and acryloyl or methacryloyl chloride is carried out in a solvent such as hexane or benzene in the presence of an acid acceptor such as triethylamine to give the compound of the formula.
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