Abstract Recently, the fast advancement of bio‐based polymers has boosted interest in green and sustainable materials. In this context, polybenzoxazine‐derived renewable resources have been widely investigated due to their environmental benefits high mechanical thermal properties. This study focused on synthesizing hybrid benzoxazines from bio‐phenolic compounds— vanillin, thymol, carvacrol— combined with Jeffamine D‐230 paraformaldehyde. The chemical structures (Van‐JD, Thy‐JD, Car‐JD) were...

1,3-Dioxole derivatives were synthesized from copper(II)-catalyzed cyclization reactions of carbonyl ylides derived 3-methylenebicyclo[2.2.1]heptan-2-one and dimethyl diazomalonate. The reaction mechanisms leading to all possible products have been extensively investigated by density functional theory. generally accepted mechanism proposed Doyle12 for the carbene transformation applied this system first time shed light on understand catalytic activity Cu(acac)2. Calculations shown that...

Abstract The [Cu(acac) 2 ]‐catalyzed reactions of several tertiary enaminones with three diazocarbonyl compounds, i.e. , dimethyl diazomalonate, ethyl diazoacetoacetate, and diazoacetate, yielded amino‐ additionally carbonyl‐substituted dihydrofurans, together further furan derivatives. Due to the conjugation α ‐carbonyl/ ‐Ph groups, proceeded only via 1,5‐electrocyclization corresponding keto‐ylides. On other hand, in absence any ‐substituent, enaminone reacted an accompanying mechanism by...

Abstract In this study, ( E )‐ and Z )‐enones carrying only a phenyl substituent at their C( β ) atom were treaced with dimethyl diazomalonate in the presence of (acetylacetonato)copper(II). According to configuration starting enones, products dioxole or dihydrofuran derivatives, significant heterocycles natural products.

Abstract We have investigated 1,5‐electrocyclic ring‐closure reactions of conjugated esters with dimethyl diazomalonate in the presence [Cu(acac) 2 ] as catalyst. Our new protocol offers an easy entry to various polyfunctionalized γ ‐lactones high yields. Their subsequent derivatives may be used valuable intermediates, especially synthesis natural products and their analogues.

Abstract The reactions of enaminones with dimethyl diazomalonate were investigated in the presence copper(II) acetylacetonate. From reaction ( E )‐3‐[methyl(phenyl)amino]‐1‐phenylprop‐2‐en‐1‐one 6c ), 2‐[methyl(phenyl)amino]‐4‐oxonaphthalene‐1,1‐(4 H )‐dicarboxylate, was unexpectedly obtained as major product. Quinoline derivatives formed products case N ‐methyl‐ p ‐anisidino and ‐toluidino enaminones. acetyl also realized, quinoline isolated products. 3 ‐ 5 ‐dihydrofurans side these...

Abstract Carbene transfer to appropriate substrates is a highly versatile tool for the construction of carbon frameworks with increased functional and structural complexity. In this study, some novel cyclopropane derivatives were synthesized via carbenoid reactions their further reactivities investigated. (1 E )‐Buta‐1,3‐dien‐1‐yl acetate was reacted four different diazocarbonyl compounds, ethyl diazoacetate, dimethyl diazomalonate, 1‐diazo‐1‐phenylpropan‐2‐one, methyl (3...

Abstract Several furyl/thiophenyl/ N ‐methylpyrrolyl cores having aldehyde/ketone/ene‐biscarbonyl/diene‐biscarbonyl functions at their 2‐positions were reacted with diazocarbonyl compounds in the presence of metal catalysts. Between two possible reaction pathways which may take place either on 2‐substituent hetaryl or core structure, only one them was dominant for each depending substituents. Accordingly, thiophene‐2‐carbaldehyde diazo we obtained epoxy derivatives. On other hand, dimethyl...

α,β-Konjuge enon bileşikleri ile 2-diazo-5,5-dimetil-1,3-heksandionun dirodyum tetraasetat (Rh2(OAc)4) katalizörlüğünde tepkimeleri gerçekleştirilmiştir. Elde edilen ürünlerin yapıları FT-IR, GC-MS ve 1H NMR 13C yöntemleri karakterize edilmiştir. Çalışmada kullanılan ilk α,β-konjuge bileşiği olan 3-metiliden-bisiklo[2.2.1]heptan-2-onun tepkimesinden 6,6-dimetil-3,5,6,7-tetrahidro-4H-spiro[benzofuran-2,2’-bisiklo[2.2.1]heptan]-3’,4-dion tek ürün olarak elde İkinci 1-morfolinoprop-2-en-1-on...

In the classical spark system, fact that distance between electrodes is controlled separately with two separate micrometers can prevent nanoparticles from properly coating substrate surface. Therefore, in present work, system has been modified to eliminate this drawback. No study found literature simultaneous control of electrodes. A microcontroller and electromechanical were used discharge system. shaft right left teeth on it driven by a moved stepper motor, providing equal addition, second...

Novel cyclopropane derivatives are obtained by carbenoid reactions from the title acetate and diazocarbonyl compounds in presence of two different catalysts.