Organized Surface Functional Groups: Cooperative Catalysis via Thiol/Sulfonic Acid Pairing
作者:Eric L. Margelefsky、Ryan K. Zeidan、Véronique Dufaud、Mark E. Davis
DOI:10.1021/ja074761e
日期:2007.11.1
synthesis and characterization of heterogeneous catalysts containing surfaces functionalized with discrete pairs of sulfonic acid and thiolgroups are reported. A catalyst having acid and thiolgroups separated by three carbon atoms is ca. 3 times more active than a material containing randomly distributed acid and thiolgroups in the condensation of acetone and phenol to bisphenol A and 14 times more
报道了含有用不连续的磺酸和硫醇基团对官能化的表面的多相催化剂的合成和表征。具有由三个碳原子隔开的酸和硫醇基团的催化剂是大约。在丙酮和苯酚缩合为双酚 A 时比含有随机分布的酸和硫醇基团的材料活性高 3 倍,在环己酮和苯酚缩合为双酚 Z 时活性高 14 倍。 增加配对材料中的酸/硫醇距离降低活性和选择性。这项工作清楚地揭示了多相催化剂表面上两个不同官能团的纳米级组织的重要性。
COMPOUNDS WITH ACTIVITY AT ESTROGEN RECEPTORS
申请人:OLSSON Roger
公开号:US20110046237A1
公开(公告)日:2011-02-24
Disclosed herein are methods of treatment and prevention of diseases and disorders related to estrogen receptors comprising administering novel di-aromatic compounds to patients in need thereof.
Kozlikovskii, Ya. B.; Chernyaev, B. V., Journal of Organic Chemistry USSR (English Translation), 1984, vol. 20, p. 1970 - 1973
作者:Kozlikovskii, Ya. B.、Chernyaev, B. V.
DOI:——
日期:——
Nanoscale Organization of Thiol and Arylsulfonic Acid on Silica Leads to a Highly Active and Selective Bifunctional, Heterogeneous Catalyst
作者:Eric L. Margelefsky、Anissa Bendjériou、Ryan K. Zeidan、Véronique Dufaud、Mark E. Davis
DOI:10.1021/ja804082m
日期:2008.10.8
Ordered mesoporous silicas functionalized with alkylsulfonic acid and thiol group pairs have been shown to catalyze the synthesis of bisphenols from the condensation of phenol and various ketones, with activity and selectivity highly dependent on the distance between the acid and thiol. Here, a new route to thiol/sulfonic acid paired catalysts is reported. A bis-silane precursor molecule containing both a disulfide and a sulfonate ester bond is grafted onto the surface of ordered mesoporous silica, SBA-15, followed by simultaneous disulfide reduction and sulfonate ester hydrolysis. The resulting catalyst, containing organized pairs of arylsulfonic acid and thiol groups, is Significantly more active than the alkylsulfonic acid/thiol paired catalyst in the synthesis of bisphenol A and Z, and this increase in activity does not lead to a loss of regioselectivity. The paired catalyst has activity similar to that of a randomly bifunctionalized arylsulfonic acid/thiol catalyst in the bisphenol A reaction but exhibits greater activity and selectivity than the randomly bifunctionalized catalyst in the bisphenol Z reaction.