A method for preventing deposition of polymer scale and a coating agent therefor
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:EP0126991A1
公开(公告)日:1984-12-05
The invention provides a method for preventing deposition of polymer scale on the reactor walls in the polymerization of an ethylenically unsaturated monomer, in particular, by emulsion polymerization. The method comprises coating the reactor walls with a coating composition containing, as the essential components, (A) an organic compound having at least 5 conjugated π bonds in a molecule, (B) a chelating agent and (C) a metal compound capable of producing metal ions having a coordination number of at leas 2 which presumably forms a metallic chelate compound with the chelating agent contributing to the formation of a strongly adsorbed layer on the reactor walls. The coating composition may be further admixed with a silicic acid compound such as a colloidal silica.
Photocatalytic Dehydrogenative 6π‐Photocyclisation of Indole Derivatives via Successive Energy Transfer
作者:Yishu He、Yihao Zhang、Hang Zhao、Xing Wang、Gaofeng He、Rong Huang、Siping Wei、Zhijie Zhang、Qiang Fu
DOI:10.1002/adsc.202301174
日期:2024.2.19
Herein, a successive energy transfer (sEnT) strategy to enable a dehydrogenative 6π‐photocyclisation, without the need for an external oxidant is reported, in which the energetically unfavourable dehydrogenation is driven by energy transfer. The valuable applicability of this method was demonstrated by the scaffold hopping of indole containing bioactive molecules, as well as by the succinct synthesis of naturally occurring tetracyclic furocarbazole alkaloids. Moreover, experimental and computational studies were conducted to elucidate the reaction mechanism.