研究了SmI 2 / H 2 O /吡咯烷介导的苄醇和苄基的裂解,发现它是桦木还原的可行替代方法,可产生高收率的相应脱氧产物。已经通过动力学方法研究了该反应,并且已经提出了一种机制,该机制涉及将醇预先络合至SmI 2,然后进行胺介导的电子转移,然后进行键裂解以及第二电子和质子的转移以产生甲苯产物。 。在较高的水浓度下,该反应受到强烈抑制,表明该反应是通过内球电子从sa(II)转移至苄基而进行的,过量的水阻止了苄醇与alcohol的配位。
pre-equilibrium in the formation of iminodiazonium (ID) ion and that the N2 liberation from the ID ion is rate-determining. Under high azide concentration conditions, where the effective reactant is the ID ion, the reaction gave a linear Hammett plot with a ρ value of −0.50. The observed substituent effects on the rate and the product selectivity imply that path bifurcation on the way from the rate-determining
β‐Aryl Nitrile Construction<i>via</i>Palladium‐Catalyzed Decarboxylative Benzylation of α‐Cyano Aliphatic Carboxylate Salts
作者:Rui Shang、Zheng Huang、Xiao Xiao、Xi Lu、Yao Fu、Lei Liu
DOI:10.1002/adsc.201200383
日期:2012.9.17
The palladium‐catalyzed decarboxylative benzylation of α‐cyano aliphatic carboxylatesalts with benzyl electrophiles was discovered. This reaction exhibits good functional group compatibility and proceeds under relatively mild conditions. A diverse range of quaternary, tertiary and secondary β‐aryl nitriles can be conveniently prepared by this method.
Oxidation of C<sub>2</sub>, C<sub>3</sub>and higher alkanes by a ruthenium–oxo system
作者:Tai-Chu Lau、Chi-Keung Mak
DOI:10.1039/c39950000943
日期:——
Barium ruthenate, BaRuO3(OH)2, when dissolved in TFAâCH2Cl2 containing a few equivalents of 2,2â²-bipyridine, generates a highly reactive rutheniumâoxo system that is capable of oxidizing ethane and propane at room temperature with good yields.
Zinc Chloride Enhanced Arylations of Secondary Benzyl Trifluoroacetates in the Presence of β-Hydrogen Atoms
作者:Hui Duan、Lingkui Meng、Denghui Bao、Heng Zhang、Yao Li、Aiwen Lei
DOI:10.1002/anie.201002116
日期:2010.8.23
Zinc or swim: Arylation of benzyltrifluoroacetates with arylzinc reagents in the presence of β‐hydrogen atoms were realized under mild conditions. Both electron‐rich and electron‐deficient arene substrates were successfully arylated. This arylation method could offer a very versatile synthetic route to access a series of diversity‐oriented diarylalkane motifs. TFA = trifluoroacetyl.