نتایج جستجو برای: regioselective

تعداد نتایج: 2974  

Journal: :Dalton transactions 2017
D Brackemeyer C Schulte To Brinke F Roelfes F E Hahn

Correction for 'Regioselective C8-metalation of N-phosphine tethered adenine derivatives via C8-H activation' by D. Brackemeyer et al., Dalton Trans., 2017, DOI: 10.1039/c7dt00682a.

Journal: :Chemical & pharmaceutical bulletin 2001
M Matsugi K Murata G Anilkumar H Nambu Y Kita

Regioselective nucleophilic addition of electron rich aromatics to the beta-position of acetal carbon of p-benzoquinone mono O,S-acetal was achieved by modifying the acetal moiety.

Journal: :Chemical communications 2013
Amit Kumar Zhenghua Li Sunil K Sharma Virinder S Parmar Erik V Van der Eycken

A post-Ugi indium(III)- and gold(I)-mediated regioselective intramolecular hydroarylation for the synthesis of azepino- and azocino-[c,d]indolones is described.

Journal: :Chemical communications 2009
Santiago Carballares Donald Craig Christopher J T Hyland Pengfei Lu Tanya Mathie Andrew J P White

The highly regioselective, stereospecific ring-opening of trisubstituted N-tosylaziridines possessing vinyl and hydroxymethyl groups by sulfone- and sulfide-stablised carbanions is reported.

Journal: :Chemical communications 2015
Nuria Miralles Jessica Cid Ana B Cuenca Jorge J Carbó Elena Fernández

Experimental and theoretical rationalization on regioselective mixed diboration of alkenes, with the unsymmetrical diboron reagent Bpin-Bdan, providing the protecting Bdan moiety in the internal position.

2015
Sushil Kumar Sharma D. D Agarwal

A facile, simplistic, highly efficient, environmentally safe, regioselective, controllable and economical method for the bromination of organic compounds using aqueous AlBr3-Br2 reagent system.

E. Zahedi F. Shams S. R. Emamian

In the present work, impact of Lewis acid (LA) catalysts BF3, BCl3, and BBr3 on the kinetics andregioselectivity of 1,3-dipolar cycloaddition (1,3-DC) reaction between azidobenzene and acroleinwas theoretically studied using B3LYP/6-31G* level. Our results indicate while the uncatalyzed 1,3-DC reaction under investigation takes place via a non-polar, non-regioselective, and lowasynchronous proc...

Journal: :Helvetica Chimica Acta 2021

The silyl- and germylzincation of terminal or internal propargylic alcohols by reaction with (Me3Si)3SiH/Et2Zn, [(Me3Si)3Si]2Zn/Et2Zn Ph3GeH/Et2Zn is examined. These reactions proceed through the addition silicon- germanium-centered radicals across carbon≡carbon triple bond followed trapping diethylzinc produced vinyl radical homolytic substitution at zinc atom. influence hydroxy unit on regio-...

Journal: :Chemical Science 2021

We report a unified chemoenzymatic asymmetric synthesis of five prostaglandins, featuring two enzymatic redox transformations and copper(ii)-catalyzed regioselective p-phenylbenzoylation.

Regioselective Diels-Alder reactions of acyl-1,4-benzoquinones 1 with, severally, isoprene, trans-piperylene,1-acetoxy-1,3-butadiene and 1-methoxy-1,3-butadiene gave the corresponding adducts 2 in high yield. Treatment of the adducts 2 with manganese dioxide gave regiospecifically the corresponding 1,4-naphthoquinones 3. In several cases, the adducts of the acetylquinones afforded intermediates...

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