نتایج جستجو برای: alder tree

تعداد نتایج: 174137  

1998
Patrick C Hew

We correct for missed breaks in Lim-Alder Extended Edges.

2002
Kohsuke Nishimoto Shokaku Kim Yoshikazu Kitano Masahiro Tada Kazuhiro Chiba

During the last two decades, organic reactions in aqueous media have been attracting increasing attention. Furthermore, It has been established that some DielsAlder reaction dramatically accelerated in aqueous media. These have been alternatively ascribed to hydrophobic association of the reacting partners, micellar catalysis, solvophobicity, high internal solvent pressure, cohesive energy dens...

Journal: :Dendrochronologia 2021

The global role of tree-based climate change mitigation is widely recognized; trees sequester large amounts atmospheric carbon, and woody biomass has an important in the future biobased economy. In national carbon budgets, growing hedgerows tree rows are often allocated same increment data as forest-grown trees. However, conditions these linear habitats different from forests given that receive...

2013
Sisir Nandi Alessandro Monesi Viktor Drgan Franci Merzel Marjana Novič

BACKGROUND In the present study, we show the correlation of quantum chemical structural descriptors with the activation barriers of the Diels-Alder ligations. A set of 72 non-catalysed Diels-Alder reactions were subjected to quantitative structure-activation barrier relationship (QSABR) under the framework of theoretical quantum chemical descriptors calculated solely from the structures of dien...

Journal: :Chemical communications 2002
Ziwei Xiao Brian O Patrick David Dolphin

Diels-Alder reactions of nickel(II) N-confused tetraarylporphyrins as dienophiles with o-benzoquinodimethane yield nickel(II) N-confused isoquinoporphyrins.

2013
Khaled Rashed Ana Carolina Cardoso Sucupira José Machado Moita Neto Chistiane Mendes Feitosa

2010
Mohit L Deb Pulak J Bhuyan

Some novel annulated pyrido[2,3-d]pyrimidines 6 and 7 were synthesized stereoselectively by intramolecular hetero Diels-Alder reactions involving 1-oxa-1,3-butadienes.

2009
Adam Robert Renslo Rick L. Danheiser Melanie Bartow Wills

Alkyliminoacetonitrile derivatives were investigated as dienophiles in the Diels-Alder reaction. These activated imines react with dienes in intramolecular [4+2] cycloadditions to provide products with either the quinolizidine or indolizidine ring system, depending on the length of the tether connecting diene and dienophile. Quinolizidine cycloadducts are formed in good yield and with high ster...

Journal: :journal of physical & theoretical chemistry 2013
a. nouri e. zahedi f. joneydi jafari s. sedaghat

in the present work, the regioselectivity for a series of diels–alder reactions (4 reactions) has beenstudied using hardness, electrophilicity and polarizability of products.furthermore,thermodynamicand kinetic calculations have been done. in all results predicted pararegioisomer is more favorableregioisomerinthese investigated reactions.all calculations have been done at the dft-b3lyp/6-31g(d)...

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