Enzymatic Ring-Opening Polymerization of Lactones by Lipase Catalyst: Mechanistic Aspects (Record no. 44564)

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fixed length control field 01835nam a2200229Ia 4500
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control field MX-MdCICY
005 - DATE AND TIME OF LATEST TRANSACTION
control field 20250625140629.0
040 ## - CATALOGING SOURCE
Transcribing agency CICY
090 ## - LOCALLY ASSIGNED LC-TYPE CALL NUMBER (OCLC); LOCAL CALL NUMBER (RLIN)
Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) B-10326
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245 10 - TITLE STATEMENT
Title Enzymatic Ring-Opening Polymerization of Lactones by Lipase Catalyst: Mechanistic Aspects
490 0# - SERIES STATEMENT
Volume/sequential designation Macromol. Symp., 240, p.178-185, 2006
520 3# - SUMMARY, ETC.
Summary, etc. Mechanistic aspects of lipase-catalyzed ring-opening polymerization (ROP)of lactones to give polyesters are discussed from accumulated experimental data and new insight. Comparison of the ROP reactivity by lipase catalyst with the anionic ROP reactivity by a metal-catalyst clearly demonstrates the characteristics of lipase catalysis; the larger ring-sized monomers with lower ring strain showed higher polymerizability than medium ring-sized ones, in contrast to the anionic ROP showing the reverse direction where the ring strain of monomer is operative. The enzyme-catalysis involves an acyl-enzyme intermediate formation as a key-step. From the copolymerization results a new mechanism is proposed, that involves the formation of the acyl-enzyme intermediate (acylation step)and/or the nucleophilic attack of the propagationg alcohol end to the carbonyl carbon of the intermediate to open the monomer ring (deacylation step)as the rate-determining step. The structure of the propagating alcohol end (primary or secondary)affects much on which step is more operative.
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element CATALYSIS
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element LACTONE
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element LIPASE ENZYME
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element REACTION MECHANISM
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element RING-OPENING POLYMERIZATION
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Kobayashi, S.
856 40 - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier <a href="https://drive.google.com/file/d/1zzPia3QVtFd9XjF-PaYycrpG9S8NVfgI/view?usp=drivesdk">https://drive.google.com/file/d/1zzPia3QVtFd9XjF-PaYycrpG9S8NVfgI/view?usp=drivesdk</a>
Public note Para ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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Source of classification or shelving scheme Clasificación local
Koha item type Documentos solicitados
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  Clasificación local     Ref1 CICY CICY Documento préstamo interbibliotecario 25.06.2025   B-10326 25.06.2025 25.06.2025 Documentos solicitados