| 摘要 |
NEW MATERIAL:A compound shown by formula I [X is-(CH2CH2S)n2-H; Y is H or-(CH2)n3-S-X; n1 is 1-5 ; n2 is 0-2 ; n3 is 1-5]. EXAMPLE:2, 5-Dimercaptomethyl-1, 4-dithian. USE:An optical material having high refractive index and large Abbe's number. Providing a polymer having excellent heat resistance, weather resistance and transparency, which is useful as a lens of eyeglasses, accessory, etc. PREPARATION:For example, diallyl disulfide shown by formula II is reacted with bromine to give a cyclic dimerized bromide shown by formula III. This compound is reacted with thiourea to form isothiuronium salt shown by formula IV. This compound is hydrolyzed with an aqueous solution of sodium hydroxide and made acidic with hydrochloric acid to give a compound shown by formula V wherein group X is H (n2=0), Y is H and n1=1. |
