Results 171 to 180 of about 2,911,708 (228)

Advances in Carbon–Element Bond Construction under Chan–Lam Cross-Coupling Conditions: A Second Decade

Synthesis, 2020
Copper-mediated carbon–heteroatom bond-forming reactions involving a wide range of substrates have been in the spotlight for many organic chemists. This review highlights developments between 2010 and 2019 in both stoichiometric and catalytic copper ...
Ajesh Vijayan, D. N. Rao, K. Radhakrishnan, P. Lam, Parthasarathi Das   +4 more
semanticscholar   +1 more source

Electrochemically Enabled Chan-Lam Couplings of Aryl Boronic Acids and Anilines.

Organic Letters, 2019
The Chan-Lam reaction remains a highly utilized transformation for C-N bond formation. However, anilines remain problematic substrates due to their lower nucleophilicity.
Ryan P Wexler, Philippe Nuhant, Timothy J Senter, Zachary J Gale-Day   +3 more
semanticscholar   +1 more source

Chemoselective Chan-Lam Coupling Reactions between Benzimidazoline-2-Thiones and Arylboronic Acids.

Journal of Organic Chemistry, 2019
An efficient Chan-Lam-type methodology for the selective synthesis of S-arylbenzimidazoles and N,S-diarylbenzimidazoles was developed. The selectivity was controlled by varying the amount of the catalyst Cu(OAc)2•H2O, temperature and solvent switching ...
Xingtong Liu,, Zhi‐Bing Dong
semanticscholar   +1 more source

Rejoinder To Chan And Chan

2007
This chapter provokes serious discussion and inspires inquiry into the possibilities of new forms of global moral integration. Hoiman Chan’s and Shun-hing Chan’s criticisms present important challenges to the author’s understanding of religion, history, sociology, and perhaps even theology.
openaire   +1 more source

Building Chan Chan: A Project Management Perspective

Latin American Antiquity, 2011
AbstractThe labor investment in ancient monumental architecture is an important factor in hypotheses concerning a society’s size, organization, and social complexity. Most methods of quantifying labor expenditures are limited to simply designed structures with a minimal number of elements.
openaire   +1 more source

Il Parco Archeologico di Chan Chan, Perù

2016
L'articolo descrive le ricerche della Missione Italiana in Perù che opera sul complesso archeologico di Chan CHan (Trujillo) dall'anno 2002. Chan CHan è il più grande insediamento in terra cruda dell'America Latina ed è iscritto nella lista UNESCO del Patrimonio Mondiale dal 1986.
Colosi F, Orazi R
openaire   +2 more sources

Chan

2012
The farming community of Chan thrived for over twenty centuries, surpassing the longevity of many larger Maya urban centers. Between 800 BC and 1200 AD it was a major food production center, and this collection of essays reveals the important role played by Maya farmers in the development of ancient Maya society."Chan" offers a synthesis of compelling ...
openaire   +1 more source

Integridad material e immaterial de Chan Chan

2022
La integridad de Chan Chan, sufrió graves fracturas con la creación de las carreteras Huanchaco - Trujillo y del evitamiento que causó una fractura incluso con el mar, históricamente ligado al complejo arqueológico. La carrettera Huanchaco - Trujillo, con el crecimiento de las actividades comerciales, está provocando la pérdida de la integridad ...
Colosi F, Orazi R
openaire   +2 more sources

Community Settlement Patterns at Chan Chan, Peru

American Antiquity, 1970
AbstractA recent surface survey was conducted at the site of Chan Chan, Peru, for purposes of investigating the nature of community settlement patterns. Previous writers have tended to view these in terms of the speculated sociological implications of specific largescale architectural features known asciudadelas.
openaire   +1 more source

A Review on the Latest Progress of Chan‐Lam Coupling Reaction

, 2020
Jin-Quan Chen, Jing-Hang Li, Zhi‐Bing Dong   +2 more
semanticscholar   +1 more source