esterification. Comparing with previously reported homogeneous and heterogeneous catalysts, Zr‐MOF‐808‐P can promote the reaction for a wide range of primary, secondary and tertiary amides with n‐butanol as nucleophilic agent. Different alcohols have been employed in amide esterification with quantitative yields. Moreover, the catalyst acts as a heterogeneous catalyst and could be reused for at least five
An efficient general method for esterification of aromatic carboxylic acids
作者:Bhaskar D. Hosangadi、Rajesh H. Dave
DOI:10.1016/0040-4039(96)01351-2
日期:1996.8
Treatment of variety of aromaticcarboxylicacids with alcohols in the presence of thionyl chloride results in excellent yields of corresponding esters. This esterification system is compatible with a wide assortment of functional groups.
ABSTRACT A practical copper-catalyzed I-substitutions of alkyl-2-iodobenzoates with alkynes have been developed using Cu powder as a catalyst under solvent, cocatalyst, and base-free conditions. This reaction system is new, facile, efficient, and economical that gives Sonogashira coupling products in excellent yields (up to 97%). The coupled products (A–J) were characterized by CHNS, 1H NMR, and 13C
Guest Binding Drives Reversible Atropisomerism in Cavitand Hosts
作者:Thanh V. Nguyen、David J. Sinclair、Anthony C. Willis、Michael S. Sherburn
DOI:10.1002/chem.200900695
日期:2009.6.8
Guest‐love‐ometer: The equilibrium inside–outside atropisomeric ratio of ortho‐substituted phenyl cavitands shows a strong solvent dependence. The competition between the ortho‐substituent and the solvent guest for the bowl cavity leads to a sensitive system for the measurement of relative guestbinding affinities.
zed carbonylations involved either toxic carbon monoxide (CO) gas as carbonylating agent or functional-group-assisted ortho sp2 C–H activation (i.e., ortho acylation) or carbonylation by activation of the carbonyl group (i.e., via the formation of enamines). Contradicting these methods, here we describe an environmentally benign process, [Pd]-catalyzed direct carbonylation starting from simple and