Studies on the carboxymethylation and methylation of bisphenol A with dimethyl carbonate over TiO2/SBA-15
摘要:
Carboxymethylated species were selectively synthesized from dimethyl carbonate (DMC) and bisphenol A (BPA) over TiO2/SBA-15. On the basis of catalyst characterization by means of XRD, FT-IR, HPLC and GC-MS, the relations between catalytic performance and catalyst properties were discussed. Si-O-Ti was active sites for reaction, and the interaction mode between Ti-O-Si and DMC was main factor to determine carboxymethylation and methylation. When DMC was attacked by Ti-O-Si on two oxygen atoms of CH3-O moiety, BPA attacked carbonyl carbon to form carboxymethylated products. If the interaction occurs through the oxygen of C=O moiety, BPA attacked methyl carbon to form methylated products. Chemisorbed H2O over TiO2/SBA-15 made DMC to act as methylating agent. After chemisorbed H2O was removed, carboxymethylated species of two-methylcarbonate-ended-BPA (DmC(1)) and one-methylcarbonate-ended-BPA (MmC(1)) were selectively synthesized. (C) 2009 Elsevier B.V. All rights reserved.
Chemical Upcycling of Waste Poly(bisphenol A carbonate) to 1,4,2‐Dioxazol‐5‐ones and One‐Pot C−H Amidation
作者:Hyun Jin Jung、Sora Park、Hyun Sub Lee、Hyun Gyu Shin、Yeji Yoo、Ek Raj Baral、Jun Hee Lee、Jaesung Kwak、Jeung Gon Kim
DOI:10.1002/cssc.202100885
日期:2021.10.5
poly(bisphenol A carbonate) (PC) was achieved in this study with hydroxamic acid nucleophiles, giving rise to synthetically valuable 1,4,2-dioxazol-5-ones and bisphenol A. Using 1,5,7-triazabicyclo[4.4.0]-dec-5-ene (TBD), non-green carbodiimidazole or phosgene carbonylation agents used in conventional dioxazolone synthesis were successfully replaced with PC, and environmentally harmful bisphenol A was
本研究中使用异羟肟酸亲核试剂实现了聚(双酚 A 碳酸酯)(PC)的化学升级,产生了具有合成价值的 1,4,2-二恶唑-5-酮和双酚 A。使用 1,5,7-三氮杂双环传统二恶唑酮合成中使用的[4.4.0]-dec-5-烯(TBD)、非绿色碳二咪唑或光气羰基化剂成功地被PC替代,同时回收了对环境有害的双酚A。杂异羟肟酸表现出良好的效率和绿色化学特性,具有广阔的合成应用范围。此外,还开发了一种绿色芳基酰胺合成工艺,包括从聚碳酸酯到二恶唑酮的一锅解聚,然后是铑催化的 CH 酰胺化,包括使用光盘的克级实例。
Study on the reaction between bisphenol A and dimethyl carbonate over organotin oxide
作者:Xiaolong He、Zhenhuan Li、Kunmei Su、Bowen Cheng、Jun Ming
DOI:10.1016/j.catcom.2012.12.017
日期:2013.3
Organotin oxide was used to catalyze the reactionbetween BPA (bisphenol A) and DMC (dimethyl carbonate), and Ph2SnO (diphenyltin oxide) displays the excellent catalytic performance in transesterification and O-methylation. However, Bu2SnO (dibutyltin oxide), (PhCH2)2SnO (dibenzyltin oxide) and (C6H11)2SnO (dicyclohexyltin oxide) exhibited weaker catalytic activity but higher selectivity for C-methylation
[EN] METHOD FOR PRODUCING POLYCARBONATE OLIGOMERS<br/>[FR] PROCÉDÉ DE PRODUCTION D'OLIGOMÈRES DE POLYCARBONATE
申请人:SHELL OIL CO
公开号:WO2017112625A1
公开(公告)日:2017-06-29
A process for producing an oligomer comprising contacting a dialkyl carbonate and a dihydroxy compound in a reaction zone in the presence of an oligomerization catalyst under oligomerization conditions to form the oligomer wherein the molar ratio of dihydroxy compound to dialkyl carbonate in the reaction zone is at least 2:1.