Biocatalytic preparation of dichloropropyl acrylates. Application to the synthesis of poly(dichloropropyl acrylates)
摘要:
The synthesis of dichloropropyl acrylates from dichloropropyl dodecanoates through a transesterification process using diverse commercial lipases and whole cells (fungal resting cells) is presented. The synthesis was carried out in a solvent-free media using a conventional batch system and a packed bed reactor (PBR). The effect of water activity on the process depended on the lipase used. The commercial enzyme CALB (Candida antarctica lipase B immobilized onto a macroporous acrylic resin) showed the best performance as a biocatalyst, achieving a yield of 50% and productivity of 7.2 mu mol min(-1) g(-1) in the batch reactor and 33% and 35.8 mu mol min(-1) g(-1) in the PBR. Finally, polymeric material was prepared by suspension polymerization of the dichloropropyl acrylates synthesized using PBR. Particles with diameters between 170 and 380 mu m were obtained with a yield of 85% after 18 h reaction. (C) 2013 Elsevier B.V. All rights reserved.
Biocatalytic preparation of dichloropropyl acrylates. Application to the synthesis of poly(dichloropropyl acrylates)
摘要:
The synthesis of dichloropropyl acrylates from dichloropropyl dodecanoates through a transesterification process using diverse commercial lipases and whole cells (fungal resting cells) is presented. The synthesis was carried out in a solvent-free media using a conventional batch system and a packed bed reactor (PBR). The effect of water activity on the process depended on the lipase used. The commercial enzyme CALB (Candida antarctica lipase B immobilized onto a macroporous acrylic resin) showed the best performance as a biocatalyst, achieving a yield of 50% and productivity of 7.2 mu mol min(-1) g(-1) in the batch reactor and 33% and 35.8 mu mol min(-1) g(-1) in the PBR. Finally, polymeric material was prepared by suspension polymerization of the dichloropropyl acrylates synthesized using PBR. Particles with diameters between 170 and 380 mu m were obtained with a yield of 85% after 18 h reaction. (C) 2013 Elsevier B.V. All rights reserved.
We describe here the first example in which glycerol has been transformed into chlorohydrin esters using an ionic liquid and hydrated aluminium chloride. The method avoids using Crown-18 ether, which was needed to obtain a similar yield when KCl was used. Alkyl and aryl acids can be used, although yields are very dependent on the carboxylic acid used.
This study reports the high enantiomeric preference of whole cell lipase from Aspergillus flavus wild-type that allows the preparation of a chiral secondary alcohol. Whole cells prepared from a wild-type Aspergillus flavus strain were used as biocatalysts to prepare (R)-1-phenylethyl acetate. (R)-1-Phenylethanol was esterified into (R)-1-phenylethyl acetate with a 94.6% enantiomeric excess (ee) within 24h at 40 degrees C and (S)-1-phenylethanol remained in the reaction medium with a >99%ee. Besides, this biocatalyst allows the preparation of ethyl laurate and a mixture of 2-chloro-1-(chloromethyl)ethyl acrylate and 2,3-dichloro-1-propyl acrylate. The ethyl laurate yield was 96%, whereas the synthesis of a mixture of the acrylate regioisomers, 2-chloro-1-(chloromethyl)ethyl acrylate and 2,3-dichloro-1 -propyl acrylate gave similar yields to those obtained using commercial lipases. (C) 2013 Elsevier B.V. All rights reserved.
Gruen; v.Skopnik, Chemische Berichte, 1909, vol. 42, p. 3753