Search results for "Acetal"

Tetranitroresorcin[4]arene: synthesis and structure of a new stereoisomer

2009

The direct reaction between 2-nitroresorcinol and acetaldehyde in alkaline medium yields tetranitro-C1-resorcin[4]arene in a moderate 8.2% overall yield which was characterized by single crystal X-ray crystallography, 1H NMR spectroscopy and electrospray ionization mass spectrometry (ESI-MS). In solution and in the solid state, the product adopts a unique, thermally stable and unprecedented rcct-boat conformation.

Copper-Assisted Hemiacetal Synthesis: A Cu II Chain Obtained by a One-Step in situ Reaction of Picolinaldehyde

2014

International audience; The 1D polymer complex [Cu2(L)2(SCN)2]n (1 ) has been synthesised in a one‐step in situ reaction of picolinaldehyde with sodium thiocyanate. The complex 1 was characterised by FTIR spectroscopy, UV/Vis spectrophotometry and elemental analysis. The crystal structure of complex 1 shows that chains of dimer complexes are formed with tetra‐ and pentacoordinate copper centres alternately linked by one thiocyanato and two alkoxido bridges. Variable‐temperature magnetic measurements showed a strong antiferromagnetic interaction between the copper centres within the dimer mediated by the two alkoxido bridges with a J value of –374 cm–1, which is in agreement with the DFT‐cal…

PHARMACOLOGICAL MODULATION OF OPERANT BEHAVIOUR FOR ACETALDEHYDE. INVOLVEMENT OF D2 AND CB1 RECEPTORS.

2013

Acetaldehyde (ACD), the first metabolite of ethanol, has rewarding and motivational properties, as shown by behavioural studies specifically tailored for studying addictive-like behaviour (1, 2). The rewarding and incentive effects of alcohol and others addictive substances, result from their capability to enhance mesolimbic dopamine (DA) transmission, as well as to affect the cannabinoid system, which is able to fine-tune the activity of DA neurons (3). ACD directly increases DA neurotransmission (4), but the neural underpinning the operant behaviour for oral-self administered ACD still remains poorly understood. Since D2 and CB1 receptors are involved in alcohol addiction (3), as well as …

Synthesis and comparison of the antiinflammatory activity of manoalide and cacospongionolide B analogues.

1998

We have synthesized analogues of two naturally occurring antiinflammatory marine compounds, manoalide and cacospongionolide B, containing a pyranofuranone moiety which is considered the pharmacophoric group. The two compounds, and hence their analogues, differ in the presence or absence in the dihydropyran ring of an hemiacetal function which was considered essential to irreversibly inactivate phospholipase A 2 (PLA 2 ). The two series of compounds were tested for their inhibitory effects on secretory PLA 2 belonging to the groups I, II, and III, and the activities were found to be similar in both series, irrespective of the presence or absence of the additional hemiacetal function. In addi…

Nuovi derivati della Dopamina nell’Addiction da sostanze d’abuso: studi preclinici su modelli sperimentali murini

Manipulation of the DA signal on the onset of relapse of ACD

2013

It's widely known that all addictive drugs show analogous pathological behaviours consisting in compulsive drug seeking,loss of self –control and propensity to relapse. This evidence is suggestive of a common brain mechanism involving the Ventral Tegmental Area and Nucleus Accumbens whereby mesocorticolimbimc dopamine pathway. Dfferent and apparently anthitetic classes of drugs of abuse manage to increase DA release, in the aforementioned areas (Di Chiara, 1988; 1995). Reductions in activity of the mesolimbic dopamine system in the nucleus accumbes occur during drug withdrawal in animal studies (Weiss F et al. 1992; 1996). Experimental evidences have proven D2 receptor involvement in drug s…

P-77D-PENICILLAMINE, A POTENTIAL ETHANOL ANTI-RELAPSE DRUG, DOES NOT REDUCE THE VOLUNTARY ETHANOL INTAKE IN LONG-TERM EXPERIENCED RATS

2015

Experimental evidence has demonstrated that the reinforcing effects of ethanol crucially depend on the brain formation of acetaldehyde (ACD). Rationally supported by this basis, we previously evaluated a novel strategy to prevent relapse in alcoholism based on chemical ACD inactivation using D-Penicillamine (DP). Under our experimental …

Pre-Clinical Studies with D-Penicillamine as a Novel Pharmacological Strategy to Treat Alcoholism: Updated Evidences

2017

Ethanol, as other drugs of abuse, is able to activate the ventral tegmental area dopamine (VTA-DA) neurons leading to positively motivational alcohol-seeking behavior and use, and, ultimately to ethanol addiction. In the last decades, the involvement of brain-derived acetaldehyde (ACD) in the ethanol actions in the mesolimbic pathway has been widely demonstrated. Consistent published results have provided a mechanistic support to the use of ACD inactivating agents to block the motivational and reinforcing properties of ethanol. Hence, in the last years, several pre-clinical studies have been performed in order to analyze the effects of the sequestering ACD agents in the prevention of ethano…

Oxide anodes in electro-organic oxidation. Oxidation of maleic addon tungsten oxide anodes

1982

The electrochemical oxidation of maleic acid on tungsten anodes has been investigated. Glyoxal and carbon dioxide were the main products together with tartaric acid and acetaldehyde. Glyoxal is also obtained as the main product from the oxidation ofd-tartaric acid. Under the same conditions succinic acid is completely oxidized to carbon dioxide and water. The anodic dissolution of tungsten and the oxidation of water to oxygen become predominant in the final stages of the electrolyses.

P-76D-PENICILLAMINE, AN ACETALDEHYDE SEQUESTERING AGENT, REDUCES ETHANOL PREFERENCE IN ALCOHOL-NAÏVE RATS

2015

In previous investigations, we demonstrated that D-penicillamine (DP), a sulfhydryl aminoacid which has been studied as sequestration agent of acetaldehyde (ACD), is able to prevent the alcohol deprivation effect (ADE) but not voluntary ethanol consumption. Both results were obtained in long-term ethanol-experienced Wistar rats. Based on a previous …