Morpholine

About: Morpholine is a research topic. Over the lifetime, 5411 publications have been published within this topic receiving 51063 citations. The topic is also known as: diethylene imidoxide & diethylene oximide.

Phosphorus–nitrogen compounds: part 16. Synthesis, stereogenism, anisochronism and the relationship between 31P NMR spectral and crystallographic data of monotopic spiro-crypta phosphazene derivatives

Abstract: The condensation reactions of N2O3-donor type coronands (1–3) with hexachlorocyclotriphosphazatriene, N3P3Cl6, resulted in the formation of spiro-crypta phosphazene derivatives (4–6). These compounds with excess morpholine and 1,4-dioxa-8-azaspiro[4,5]decane (DASD) afford fully substituted morpholino (7 and 10) and 1,4-dioxa-8-azaspiro[4,5]deca (8)-substituted phosphazene derivatives, respectively. Whilst, in the same conditions, the reactions of 4, 5 and 6 with pyrrolidine, morpholine and DASD also produce partially pyrrolidino-substituted geminal (9 and 11), mono-substituted pyrrolidino (12), morpholino (13) and 1,4-dioxa-8-azaspiro[4,5]deca (14) phosphazenes. It has been clearly observed that the chloride replacement reactions of 4, 5 and 6 with pyrrolidine lead to the geminal products. Compounds 7, 8 and 10 are the first examples of anisochronic tetrakis (amino) phosphazenes according to 31P NMR data. The structures of 7, 8 and 10–14 have been determined by FTIR, MS, 1H, 13C and 31P NMR, DEPT, and HETCOR spectral data. The solid-state structures of 9, 13 and 14 have been examined by X-ray diffraction techniques. The sums of the bond angles around the spiro cyclic nitrogen atoms [344.8(4)° and 347.6(4)°] of 9, indicate that the nitrogen atoms have pyramidal geometries. Thus, the N atoms seem to have stereogenic configurations. Compounds 12–14 also have two stereogenic P-atoms, and they are expected to be in the mixture of enantiomers. The relationships between NPN (α and α′) bond angles and δPspiro values and the correlation of Δ(P–N) with δPspiro and Δ(δP) values are presented.

Adducts of Piperidine, Piperazine, Methylpiperazine, and Morpholine with Bis(β-Ketoenolates) of Nickel(II)

Abstract: The bis(β-ketoenolates)nickel(II) adducts of piperidine, piperazine, methylpiperazine, and morpholine are isolated in the solid state and investigated by magnetic measurements and electronic and i....

Role of Amine in the Mitigation of CO 2 TOP of the line Corrosion

Abstract: The principal objective of this work is to investigate and understand the top of the line corrosion (TLC) inhibition mechanism in the presence of amines: diethylamine and morpholine. TLC can be defined as corrosion of carbon steel under water condensation conditions in the presence of acid gases such as CO2, which can be a problem in wet natural gas transportation lines. In order to define the possible interactions between the tested amines and the steel surface, the surface charge was investigated by determining the potential of zero charge (PZC). The PZC was measured by means of electrochemical impedance spectroscopy (EIS) in a 1 wt% NaCl solution at different pH values. The possible inhibitive properties of diethylamine and morpholine were first tested under full immersion in the water phase—a condition corresponding to the so-called “bottom of the line” situation in gas pipelines, using linear polarization resistance and EIS. This was followed by tests in the gas phase under water condensing condition...