A method for forming a monomeric carbonate includes the step of combining a monofunctional alcohol or a difunctional diol with an ester-substituted diaryl carbonate to form a reaction mixture. Similarly, a method for forming a monomeric ester includes the step of combining a monofunctional carboxylic acid or ester with an ester-substituted diaryl carbonate to form a reaction mixture. These methods further include the step of allowing the reaction mixtures to react to form a monomeric carbonate or a monomeric ester, respectively.
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Page/Page column 7
(2010/06/13)
NOVEL CATALYSIS OF o-NITROPHENYL CARBONATES BY p-DIMETHYLAMINOPYRIDINE
Transesterification reactions of o-nitrophenyl carbonates have been found to be greatly facilitated by use of p-dialkylaminopyridines as catalysts.A 20-fold rate increase is observed using 0.01 eq. of p-dimethylaminopyridine in place of 2.00 eq. of triethylamine.Such rate enhancement is not observed with p-nitrophenyl carbonates: 2.00 eq. of Et3N causes reaction to occur 8.5 times faster than 0.01 eq. of DMAP.DMAP catalyzed reactions of o-nitrophenyl carbonate have been used to prepare aromatic carbonates at 0 deg C in high yields, and avoid the necessity of using 2 equiv. of base.
Brunelle, Daniel J.
p. 1739 - 1742
(2007/10/02)
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