Influence of substituents on the infrared stretching frequencies of carbonyl group in esters of benzoic acid
作者:Vilve Nummert、Oksana Travnikova、Signe Vahur、Ivo Leito、Mare Piirsalu、Vahur Mäemets、Ivar Koppel、Ilmar A. Koppel
DOI:10.1002/poc.1112
日期:2006.10
resonance effect on νCO was found to be important in the case of +Rpara substituents in the benzoyl part of phenyl benzoates as well. The carbonyl stretching frequencies of ortho derivatives in phenoxy part were shown to correlate with the inductive substituent constant σI only. In the benzoyl part of the esters the carbonyl stretching frequencies of cis and trans conformers (relative to the carbonyl group)
的苯甲酸的C 25周取代的苯基的酯红外光谱6 ħ 5 CO 2 C ^ 6 ħ 4 -X(X H,3-氯,3-F,3-CN,3-NO 2,3-CH 3,3- OH,3-NH 2,4-CL,4-F,4-NO 2,4-CN,4-OCH 3,4-CH 3,4-NH 2,2-氯,2-F,2-I ,2-NO 2,2-CF 3,2-CN,2-CH 3, 2-OCH 3,2-N(CH 3)2,2-C(CH 3)3),8烷基苯甲酸酯ç 6 ħ 5CO 2 R(X CH 3,CH 2 CH 3,CH 2 Cl,CH 2 CN,CH 2 C CH,CH 2 CH 2 Cl,CH 2 CH 2 OCH 3,CH 2 C 6 H 5)和22苯基取代的苯甲酸XC的酯6 ħ 4 CO 2 C ^ 6 ħ 5(X 3-CL,3-NO 2,3-CH 3, 3-N(CH 3)2,4-F,4-CL,4-溴,4- NO 2,4-CH
ANOMALOUS ORIENTATIONAL EFFECTS DURING BENZOYLOXYLATIONS BY “SILVER BROMIDE DIBENZOATE”
作者:Derek Bryce-Smith、Neil S. Isaacs、Seddeg O. Tumi
DOI:10.1246/cl.1984.1471
日期:1984.9.5
formed from bromine and silver benzoate reacts with both arenes and alkanes to form aryl and alkyl benzoates, respectively. Highly unusual substituent effects are observed in the benzoyloxylations of arenes. Electron-withdrawing groups (e.g. –NO2, –CN, –CO–) on the aromatic ring facilitate reaction though directing the attacking reagent exclusively to the meta position. In alkanes, tertiary positions are
Ni(II)-Mediated Photochemical Oxidative Esterification of Aldehydes with Phenols
作者:Lu-Lu Chai、You-Hui Zhao、David James Young、Xinhua Lu、Hong-Xi Li
DOI:10.1021/acs.orglett.2c02560
日期:2022.9.30
The photopromoted, Ni-catalyzed acceptorless dehydrogenation esterification of phenols and aromatic aldehydes has been achieved in an oxidant- and external photosensitizer-free manner. This reliable and atom-economical transformation was tolerant to a wide range of functional groups and proceeded efficiently to give various aryl benzoates in moderate to high yields. Additionally, this photocatalytic
Metal-Free Oxidative Formation of Aryl Esters by Catalytic Coupling of Acyl and Sulfonyl Chlorides with Arylboronic Acids
作者:Fang Liu、Akbar Sohail、Keyume Ablajan
DOI:10.1021/acs.joc.3c01151
日期:2024.1.5
synthesis of arylesters was developed through metal-free oxidation. This reaction employs stable and readily available acyl or sulfonyl chlorides and arylboronicacids as the starting materials and proceeds under mild reaction conditions without additional precious metal catalysts. This new strategy exhibits broad substrate tolerance and operational simplicity and gives diverse arylesters in moderate