Activation of Benzyl Aryl Carbonates: The Role of Cation−π Interactions
作者:Golipalli Ramana Reddy、Anusha S. Avadhani、Sridhar Rajaram
DOI:10.1021/acs.joc.6b00441
日期:2016.5.20
aryl carbonates can react with a nucleophile to yield an activated electrophile and an aryloxide anion. Previously, we had utilized this in the synthesis of α-nitro esters from nitroalkanes. To further understand the process of activation of these carbonates by nucleophiles, we have performed kinetic studies on the hydrolysis of carbonates using nucleophiles. Rate constants for the hydrolysis were obtained
Homogeneous catalytic oxidation of light alkanes: C-C bond cleavage under mild conditions
作者:E. G. Chepaikin、A. P. Bezruchenko、G. N. Menchikova、N. I. Moiseeva、A. E. Gekhman
DOI:10.1134/s0023158410050071
日期:2010.10
The combined oxidation of CO and C2–C4 alkanes (associated petroleum gas and natural gas components) under the action of oxygen in trifluoroacetic acid solutions in the presence of rhodium and copper chlorides was accompanied by the oxidative degradation of C-C bonds in a hydrocarbon chain with the formation of carbonyl compounds, alcohols, and esters. For butane and isobutane, the reaction path with
On the solvolysis kinetics of amidoesters derived from β-aminoalcohols
作者:Jamilah N. Hankins、Michele Gouws、Amir Mahajer、Ethan S. Kim、Kevin P. Gwaltney、John Haseltine
DOI:10.1016/j.tetlet.2012.03.017
日期:2012.5
fifteen amidoesters derived from β-aminoalcohols were solvolyzed at the ester group in mildly basic methanol-d4. All trials showed pseudo-first-order kinetics by 1H NMR. The rate constants are about 2 to 140-fold larger than those found with simple alkyl esters. The least bulky N-acyl groups generally sponsor the largest rate constants, and strongly so in two cases, but apparently not as a result of
为了更好地了解此类系统的反应性,将15种衍生自β-氨基醇的酰胺基酯在弱碱性甲醇d 4中的酯基处溶剂化。所有试验均通过1 H NMR显示出伪一级动力学。速率常数比简单烷基酯的速率常数大约2至140倍。最小体积的N-酰基基团通常提供最大的速率常数,在两种情况下强烈如此,但是显然不是由于酰胺基团和酯基团之间的空间拥挤程度较小所致。对于那些在酰胺键上倾向于抗构象的酰胺基酯,速率常数也更大。
Rabinowitsch et al., Doklady Akademii Nauk SSSR, 1957, vol. 114, p. 590