differences of the axial and equatorial conformers were evaluated with respect to the factors normally influencing conformational preference, namely, 1,3-diaxial steric interactions in the axial conformer and hyperconjugation. It was assessed that hyperconjugative interactions, sigma(C-C)/sigma(C-H) and sigma*(C-O), together with a steric effect--the destabilization of the equatorial conformer with increasing
A Facile and Efficient Method for Catalytic Acetylation of Alcohols with Acetic Acid
作者:Anindita Dewan、Utpal Bora、Dilip Kumar Kakati
DOI:10.5012/bkcs.2010.31.12.3870
日期:2010.12.20
however perchlorates are potentially explosive. Therefore, development of simple and environmentally friendly method for acetylation of alcohols utilizing inexpensive and readily available reagent is still desirable. Among the various transition metals, iron is one of the most abundant metals on the earth, and one of the most inexpensive and environmentally friendly ones. Therefore re- cently iron based
Copper-catalyzed oxidative esterification of unactivated C(sp<sup>3</sup>)–H bonds with carboxylic acids via cross dehydrogenative coupling
作者:Jiadi Zhou、Can Jin、Xiaohan Li、Weike Su
DOI:10.1039/c4ra14586k
日期:——
An effective copper-catalyzed esterification of unactivated (non-benzylic and allylic) C(sp3)–Hbonds of hydrocarbons with Selectfluor as an oxidant has been developed. This reaction could provide a direct, new and useful strategy for the synthesis of esters and alkyl alcohols by ester hydrolysis.