(3)-Methyl pentanediol bis-chlorocarbonate - is mfd. by phosgenation of the diol and used in polycarbonate prodn.

摘要

New 3-methyl-pentan-1,5-diol-bis(chlorocarbonate) is of formula Cl-CO-O-(CH2)2-CH(CH3)-(CH2)2-O-CO-Cl (I). (I) is prepd. by phosgenation of 3-methyl-p ntan-1, 5-diol. In an example, 472 pts. (4 mol equivs.) 3-methyl-pentan-1,5-diol were reacted with 1000 pts. phosgene (10 mol equivs.) at 12-16 degrees C in a rotating reactor. The reaction mixt. contg. 20% COCl2, was then allowed to flow to a post-reaction zone where it was degassed at 70 degrees C/70 mbars.