[EN] BIFUNCTIONAL AND POLYFUNCTIONAL COINITIATORS IN DENTAL COMPOSITIONS [FR] CO-INITIATEURS BIFONCTIONNELS ET POLYFONCTIONNELS DANS DES COMPOSITIONS DENTAIRES
A sustainable protocol of olefinmetathesis in non-degassed, undistilled ethyl acetate under air with commercially available self-scavenging ruthenium catalysts is described. Furthermore, a time economical, cost-effective and scalable method of removal of ruthenium residues is presented. Treatment of post-reaction mixtures with an isocyanidescavenger and then with acid followed by a simple filtration
BIFUNCTIONAL AND POLYFUNCTIONAL COINITIATORS IN DENTAL COMPOSITIONS
申请人:Dentsply DeTrey GmbH
公开号:EP3653194A1
公开(公告)日:2020-05-20
A dental composition comprising
(a) a polymerizable monomer; and
(b) an initiator system comprising
(b-1) a sensitizer or an oxidizing agent of a redox initiator system; and
(b-2) a coinitiator of the following formula (I):
Q-X (I)
wherein Q and X are as defined in claim 1.p
[EN] BIFUNCTIONAL AND POLYFUNCTIONAL COINITIATORS IN DENTAL COMPOSITIONS<br/>[FR] CO-INITIATEURS BIFONCTIONNELS ET POLYFONCTIONNELS DANS DES COMPOSITIONS DENTAIRES
申请人:DENTSPLY DETREY GMBH
公开号:WO2020099518A1
公开(公告)日:2020-05-22
A dental composition comprising (a) a polymerizable monomer; and (b) an initiator system comprising (b-1) a sensitizer or an oxidizing agent of a redox initiator system; and (b-2) a coinitiator of the following formula (I): Q-X (I) wherein Q and X are as defined in claim 1.
mixtures after aqueous homogeneous olefin metathesis (AHOM) reactions have been probed to address this shortcoming. It was found that elimination of a water-soluble Ru catalyst after AHOM conducted in neat water can be achieved via addition of thiocyanate ions (with or without support of charcoal additive). The developed purification method can make the aqueous metathesis methodology more practical, allowing
传统上,烯烃复分解 (OM) 在有机溶剂中进行,例如二氯甲烷或甲苯。由于近二十年来耐水甚至水溶性钌催化剂的发展,水介质中的 OM 取得了长足的进步。然而,从水中进行的 OM 反应产物中去除钌仍然是一项重大挑战。在目前的工作中,已经探索了在水性均相烯烃复分解 (AHOM) 反应后纯化反应混合物的选定方法,以解决这一缺点。发现在纯水中进行 AHOM 后,水溶性 Ru 催化剂的消除可以通过以下方式实现:添加硫氰酸根离子(有或没有木炭添加剂的支持)。所开发的纯化方法可以使水性复分解方法更实用,从而更容易将废水溶性催化剂与水溶性复分解产物分离。不幸的是,在水/醇混合物中进行的 AHOM 反应的情况下,这种方法不能提供令人满意的结果。为了在后一种情况下分离Ru催化剂,测试了一种利用刺激响应性聚合物的方法,但结果有限。