In this work, electrochemical tests were performed to measure hydrogen permeation during free dissolution of carbon steel in the presence of the ionic liquids (ILs) 1-ethyl-3-methylimidazolium acetate [(EMIM)+(Ac)-], 1-ethyl-3-methylimidazolium bromide [(EMIM)+(Br)-], and 1-butyl-3-methylimidazolium tetrafluoroborate [(BMIM)+(BF4)-] in 5.4 mol L-1 HCl aqueous solution. The permeation inhibition efficiencies (IEp (%)) of 5-hydroxy-2-nitromethylene-hexahydropyrimidine (HPY) and a commercial corrosion inhibitor (CCI) were also evaluated. Among the ILs, the (BMIM)+(BF4)- compound presented the highest corrosion and hydrogen permeation inhibition efficiencies, with values of 23% and 30%, respectively. The (EMIM)+(Br)- and (EMIM)+(Ac)- compounds were not effective against corrosion, but they presented IEp of 15.8% and 23%, respectively. The HPY compound demonstrated 61% effectiveness in preventing corrosion, while in silico evaluation indicated no toxicity. However, neither the HPY compound nor the CCI compound inhibited the entry of hydrogen into the carbon steel during the pickling process. work ILs (ILs 1ethyl3methylimidazolium ethylmethylimidazolium 1 ethyl 3 methylimidazolium EMIM+Ac, EMIMAc EMIM + Ac , [(EMIM)+(Ac)-] EMIM+Br, EMIMBr Br [(EMIM)+(Br)-] 1butyl3methylimidazolium butylmethylimidazolium butyl BMIM+BF4 BMIMBF4 BMIMBF BMIM BF4 BF [(BMIM)+(BF4)- 54 5 4 5. L1 L L- solution % (%) 5hydroxy2nitromethylenehexahydropyrimidine hydroxynitromethylenehexahydropyrimidine hydroxy 2 nitromethylene hexahydropyrimidine (HPY (CCI evaluated (BMIM)+(BF4) 23 30 30% respectively EMIM+Br (EMIM)+(Br) EMIM+Ac (EMIM)+(Ac) 158 15 8 15.8 61 toxicity However process [(EMIM)+(Ac)- [(EMIM)+(Br)- BMIM+BF [(BMIM)+(BF4) (% nitromethylenehexahydropyrimidine (BMIM)+(BF4 (EMIM)+(Br (EMIM)+(Ac 15. 6 [(EMIM)+(Ac) [(EMIM)+(Br) [(BMIM)+(BF4 ( (BMIM)+(BF [(EMIM)+(Ac [(EMIM)+(Br [(BMIM)+(BF

Abstract 2-(1,3-Benzoxazol-2(3H)-ylidene)-3-oxo-3-phenylpropanenitrile (1) and methyl-2-(1,3-benzoxazol-2(3H)-ylidene)(cyano)acetate (2) are observed as single isomers by NMR spectroscopy. A theoretical study was carried out to investigate if this is due to the exclusive presence of the most stable diastereoisomer or if the ene moiety undergoes fast rotation, thereby allowing for the observation of an average conformer. Indeed, the pronounced stabilization of the E stereoisomer, attributed to intramolecular hydrogen bonding, makes it the single obtained product. 21,3Benzoxazol23Hylidene3oxo3phenylpropanenitrile 213Benzoxazol23Hylidene3oxo3phenylpropanenitrile BenzoxazolHylideneoxophenylpropanenitrile 2 1,3 Benzoxazol 3H ylidene 3 oxo phenylpropanenitrile 1 H (1 methyl21,3benzoxazol23Hylidenecyanoacetate methyl213benzoxazol23Hylidenecyanoacetate methylbenzoxazolHylidenecyanoacetate methyl benzoxazol cyano acetate (2 spectroscopy rotation conformer Indeed stereoisomer bonding product 21 3Benzoxazol23Hylidene3oxo3phenylpropanenitrile Hylidene 13 1, ( methyl21 3benzoxazol23Hylidenecyanoacetate Hylidenecyanoacetate methyl2 benzoxazolHylidenecyanoacetate

ABSTRACT Cardanol is a constituent of Cashew Nut Shell Liquid that presents larvicidal activity against Aedes aegypti. The isolation of cardanol is somewhat troublesome, however, in this work we describe an efficient and inexpensive method to obtain it as a pure material. The compound was used as starting material to make chemical transformation leading to saturated cardanol, epoxides and, halohydrins. These derivatives were tested for toxicity against Aedes aegypti larvae. The results showed that iodohydrins are very promising compounds for making commercial products to combat the vector mosquito larvae presenting a LC50 of 0.0023 ppm after 72 h of exposure.

Os etenoditioacetais polarizados são conhecidos como importantes intermediários em muitos processos de síntese. Neste trabalho, reporta-se a anelação livre de metal de transição de 1,1-bis(tiometil)-2-nitroetileno com hidroxilalquilaminas e alquildiaminas. Esta metodologia permite a síntese direta de N-heterociclos tais como imidazolidinas, oxazolidinas e benzoxazóis sob irradiação de micro-ondas. Estes compostos foram avaliados como inibidores da acetilcolinesterase usando um reator capilar contendo a enzima imobilizada acoplado a um espectrômetro de massas.

Polarized ketene dithioketals have been recognized as useful building blocks in many synthetic operations. In this work, a transition-metal-free annulations of 1,1-bis(thiomethyl)-2-nitroethylene with hydroxylalkylamines or alkyldiamines have been reported. This methodology provides a directed approach to N-heterocycles, e.g., imidazolidines, oxazolidines and benzoxazoles under microwave conditions. These compounds were evaluated as acetylcholinesterase inhibitors by using an enzyme immobilized capillary reactor-tandem mass spectrometry.

Neste trabalho nós relatamos o uso de microondas como fonte de energia para promover a síntese de uma série de nitroeteno N,S-acetais com bons rendimentos. Estes compostos são intermediários muito úteis para a síntese de sistemas heterocíclicos nitrogenados

In this paper we report the use of microwaves as heat source to promote the synthesis of a series of nitroketene N,S-acetals with good to excellent isolated yields. These compounds are very useful intermediates for synthesizing nitrogen-containing heterocycles.