Synthetische Studien über die Beziehung zwischen chemischer Konstitution und antimikrobischer Wirkung XI. Mit H. Tietz: Zwei- und dreifach hydroxylierte oder oxalkylierte Benzoesäuren und deren Ester
aldehydes with alcohols as well as dehydrogentive cross-coupling of primary alcohols to produce esters have been developed using a Rh-terpyridine catalyst. The catalyst demonstrates broad substrate scope and good functional group tolerance, affording esters highly selectively. The high chemoselectivity of the catalyst stems from its preference for dehydrogenation of benzylic alcohols over aliphatic ones. Preliminary
已经使用 Rh-三联吡啶催化剂开发了醛与醇的脱氢交叉偶联以及伯醇的脱氢交叉偶联以生产酯。该催化剂表现出广泛的底物范围和良好的官能团耐受性,可高度选择性地提供酯。该催化剂的高化学选择性源于其对苄醇脱氢的偏好优于脂肪醇。初步机理研究表明,活性催化剂是二聚 Rh( II ) 物种,通过涉及金属-基础-金属协同作用的机制进行操作。
Solvent-Free Esterification of Carboxylic Acids and Alcohols in the Presence of Silphos [PCl<sub>3-n</sub>(SiO<sub>2</sub>)<sub>n</sub>] as a Heterogeneous Phosphine Reagent
Abstract An efficient solvent-free method for the preparation of esters from various aromatic and aliphatic acids with primary, secondary, and tertiary alcohols using a heterogeneous phosphinereagent, silphos [PCl3-n(SiO2)n], in good yields is reported. GRAPHICAL ABSTRACT
The synthesis, characterization and antimicrobialevaluation of a new series of veratric acid derivatives are presented. Preliminary in vitro antimicrobial activity of the title compounds was assessed against a panel of microorganisms including Gram-positive and Gram-negative bacteria and fungi. Some of the veratric acid derivatives exhibited significant in vitro antimicrobial activity. QSAR investigation