ULTRASONIC SYNTHESIS, MOLECULAR STRUCTURE AND MECHANISTIC STUDY OF 1,3-DIPOLAR CYCLOADDITION REACTION OF 1-ALKYNYLPYRIDINIUM-3-OLATE AND ACETYLENE DERIVATIVES

Regioselectively, ethyl propiolate reacted with 1-(propergyl)-pyridinium-3-olate to give two regioisomers; ethyl 4-oxo-8-(prop-2-ynyl)-8-aza-bicyclo(3.2.1)octa-2,6-diene-6-carboxylate 4, ethyl 2-oxo-8-(prop-2-ynyl)-8-aza-bicyclo(3.2.1)octa-3,6-diene-6-carboxylate 5 as Blunt Wraps well as ethyl 2,6-dihydro-6-(prop-2-ynyl)furo(2,3-c)pyridine-3-carbox

Injured articular cartilage has a limited innate regenerative capacity, due to the avascular nature and low cellularity of the tissue itself.Although several approaches have been proposed to repair the joint cartilage, none of them has proven to be effective.The absence of suitable therapeutic options has encouraged tissue-engineering approaches co

Mining coal, oil and other energy will form much slope engineering, such as open-pit mine slope and oil depot slope.The groundwater seepage seriously affects the stability of these slope engineering projects.Drainage pipes are commonly used in slope engineering projects to reduce the risk of moisture decreasing soil stability.Such pipes are prone t

In recent decades, mechanisms for observation and information production have proliferated in an attempt to meet the Wall Chargers growing needs of stakeholders to access dynamic data for the purposes of informed decision-making.In the land sector, a growing number of land observatories are producing data and ensuring its transparency.We hypothesiz

We show that every Originals High Rise Loose idempotent weakly divisible residuated lattice satisfying the double negation law can be transformed into an orthomodular lattice.The converse holds if adjointness is replaced by conditional adjointness.Moreover, we show that every positive right residuated lattice satisfying the double negation law and