Results 81 to 90 of about 51,192 (201)

Efficient Synthesis of 2-Amino-4H-benzo[b] pyrans via Copper-periodic Mesoporous Organosilica Nanocomposites Catalyst in Aqueous Media

Acta Chimica Slovenica
In this study, the efficient method was introduced for the preparation of copper-periodic mesoporous organosilica nanocomposites (Cu@MOS NCs) as a high performance heterogeneous nanocatalyst. Then the nanocomposite was characterized with various methods
Roghaye Ramazannejad lori, Zahra Fahimeh Alsadat Mortazavi, Vajihe Nejadshafiee, Asadollah Hassankhani   +3 more
doaj   +1 more source

An In-Situ TEM Study of High Temperature Helium Irradiation of 4H-SiC [PDF]

SiC is an excellent candidate material for use in fusion and fission nuclear reactors. The work done in this thesis aims to understand the behaviour of SiC under He irradiation at high temperatures.
Shen, Qiang
core   +3 more sources

Reações multicomponente combinadas com reações de huisgen na síntese de compostos híbridos perilil-4H-piranos [PDF]

, 2017
Existem diversos produtos naturais que apresentam em sua estrutura anéis de 4HPiranos substituídos, sendo que muitos deles apresentam atividade biológica e farmacológica, o que os torna uma fonte inspiradora para o desenvolvimento de novos fármacos.
Paczkowski, Ingrid Maliszewski
core   +1 more source

Perehdytysmateriaalin päivittäminen Kokkolan 4H-yhdistykselle [PDF]

, 2019
Tämän toiminnallisen opinnäytetyön toimeksiantajana toimi Kokkolan 4H-yhdistys. Opinnäytetyön aiheena oli päivittää Kokkolan 4H-yhdistyksen vanha perehdytysopas tähän päivään. Vanha perehdytysopas oli vain paperiversiona ja opas oli sekava.
Koskela, Minna
core  

Development Of Si02 Thin Film On singlecrystal Sic By anodic oxidation technique. [PDF]

, 2008
Anodic silicon dioxide (Si02) thin film is growth on p- and n-type silicon (Si) and p-type 4H-silicon carbide (SiC) substrate with the thickness ranging from 50-130 nm.
Cheong, Kuan Yew, Purwadaria, Sunara, Lockman, Zainovia   +2 more
core   +1 more source

"Jos vaikka sais vaikuttaa siihen, mitä tehhää kerhossa" : Lapsilähtöisyyden lisääminen 4H-kerhotoiminnassa [PDF]

, 2019
Opinnäytetyön tarkoituksena oli tuottaa tietoa siitä, kuinka Etelä-Saimaan 4H-kerhojen toimintaa voisi kehittää lapsilähtöisemmäksi Lappeenrannan alueella.
Udd, Anni, Laamanen, Ronja
core  

Facile One-Pot Synthesis of Photochromic Pyrans

, 2016
Photochromic pyrans, including [3H]naphtho[2,1-b]pyrans, [2H]naphtho[1,2-b]pyrans, indeno-fused naphtho[1,2-b]pyrans, and heteroannulated pyrans, were synthesized in excellent yields through a facile one-pot procedure by reaction of propargyl alcohol and
Weili Zhao (1694086), Erick M. Carreira (1330920)   +1 more
core   +1 more source

HFIP-promoted Lewis acid-free one-pot synthesis of pyran derivatives under mild conditions

Results in Chemistry
A one-pot, three-component reaction of aromatic aldehyde, malononitrile, dimedone or ethyl acetoacetate was developed in which the reaction medium and promoter was 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP).
Fatemeh Zahra Nouri, Behrooz Maleki, Robabeh Baharfar, Heshmatollah Alinezhad, Samaneh Sedigh Ashrafi   +4 more
doaj   +1 more source

Facile one-pot synthesis of photochromic pyrans.

, 2003
[reaction: see text]. Photochromic pyrans, including [3H]naphtho[2,1-b]pyrans, [2H]naphtho[1,2-b]pyrans, indeno-fused naphtho[1,2-b]pyrans, and heteroannulated pyrans, were synthesized in excellent yields through a facile one-pot procedure by reaction of
Carreira EM, Zhao W
core   +1 more source

Iron(III)-Catalyzed Prins-Type Cyclization Using Homopropargylic Alcohol:  A Method for the Synthesis of 2-Alkyl-4-halo-5,6-dihydro-2H-pyrans

, 2016
A new Prins-type cyclization between homopropargylic alcohol and aldehydes in the presence of FeX3 to obtain 2-alkyl-4-halo-5,6-dihydro-2H-pyrans in good yield is described.
Pedro O. Miranda (2397970), Juan I. Padrón (2440633), Jaime Bermejo (2400757), David D. Díaz (2531212), Victor S. Martín (3037980)   +4 more
core   +1 more source