Kinetic study of thermal 1,3-dipolar cycloaddition of azomethine ylides using differential scanning calorimetry as monitoring window

Kinetics of 1,3-dipolar cycloaddition involving azomethine ylides, generated from thermal [1,2]-prototropy of the corresponding imino ester, employing differential scanning calorimetry (DSC), is surveyed. Glycine and phenylalanine derived imino esters have different behavior. The first one prefers reacting with itself at 75 ºC, rather than with the dipolarophile. However, the α-substituted imino ester gives the cycloadduct at higher temperatures. The thermal dynamic analysis by 1H NMR of the neat reaction mixture of the glycine derivative reveals the presence of signals corresponding to the dipole in very small proportion. The non-isothermal and isothermal DSC curves of the cycloaddition of phenylalaninate and diisobutyl fumarate are obtained from freshly prepared samples. The application of known kinetic models and mathematical multiple non-linear regressions (NLR) allow to determine and to compare Ea, lnA, reaction orders, and reaction enthalpy. Finally a rate equation for each different temperature can be established for this particular thermal cycloaddition.

Morocco at the Crossroads: Seizing the window of opportunity for sustainable development. MEDPRO Technical Report No. 2/April 2011

The question of state sustainability is highly relevant in the case of Morocco. Despite the image of a modernising and liberalising country, Morocco is undergoing a delicate phase in its development. The recent upheavals in the Maghreb and the Middle East alongside the growing problems of poor education and high unemployment are likely to bring to the surface the unsustainable elements of Morocco’s status quo. The central issues concern the quality of institutions, reforms aimed at promoting the rule of law, curbing corruption and overhauling the judiciary. This paper will argue that while institutional quality is a pre-requisite for successful and sustainable socioeconomic performance, this cannot be achieved unless major reforms in the political system are carried out. There exists a window of opportunity to accelerate reforms and to address the acute centralisation of Moroccan politics and decision-making, the lack of accountability of the monarchic institutions, as well as the fragility of representative bodies, such as parties and trade unions. Seizing this window of opportunity could spare Morocco a period of instability, while also assuring continuity in the framework of the transition that started in 1999 when the new king came to power.

Bay window of our room at Mrs. Schryrus on Washington. Minnie Nemby and Fanny Read. January 19 - '89

On verso: Bay window of our room at Mrs. Schryus on Washington - Minnie Nemby & Fanny Read. Jan. 19 '89

Children at the window; a handbook for the guidance of retarded children,

Mode of access: Internet.

Glass-plastic glazing for side window ejection reduction. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Extreme ultraviolet explorer : long look at the next window.

Cover title.

OSL, orbiting solar laboratory : our window on the sun.

Shipping list no.: 91-445-P.

Carpentry : being a comprehensive guide book for carpentry and joinery : with elementary rules for the drawing of architecture in perspective and by geometrical rule : also, treating of roofs, trussed girders, floors, domes, stair-cases and hand-rails, shop fronts, verandahs, window-frames,shutters, &c. &c., and public and domestic buildings, with plans, elevations, sections, &c. &c./

Mode of access: Internet.

The family dyer and scourer : being a complete treatise on the arts of dying and cleaning every article of dress, bed and window furniture, silks, bonnets, feathers, &c., whether made of flax, silk, cotton, wool, or hair : also, carpets, counterpanes, and hearth-rugs, ensuring a saving of eighty per cent /

Includes index.

The Dartmoor window again /

Mode of access: Internet.

The Dartmoor window again /

Signed by the author.