Synthesis based on cyclohexadienes. Part 24. A new total synthesis of pupukean-2-one and a facile entry to copa and ylanga type sesquiterpene skeletons

A novel tandem 5-exo-trig allyl and 3-exo-trig radical cyclisation and rearrangement to copa and ylanga type sesquiterpene skeletons from easily prepared cyclohexadienes is reported. A new total synthesis of pupukean-2-one 8, which belongs to a novel class of sesquiterpenes, involving a 5-exo-trig allyl radical cyclisation as the key step is also reported

Synthesis based on cyclohexadienes. Part 23. Total synthesis of 5-epi-pupukean-2-one

A new strategy for the construction of the isotwistane skeleton is reported from easily available cyclohexadienes which involves stereoselective alkylation of a bicyclooctenone derivative and a decarboxylative 5-exo-trig radical cyclisation as the key steps in the total synthesis of 5-epi-pupukean-2-one

Synthesis based on cyclohexadienes. Part 22. Formal syntheses of patchouli alcohol and norpatchoulenol

The preparation of 6-endo-formyl-1,3,3-trimethylbicyclo[2.2.2]octan-2-one 7 and 6-endo-acetyl-1,3,3-trimethylbicyclo[2.2.2]octan-2-one 8, the two key intermediates for the synthesis of patchouli alcohol 1 and norpatchoulenol 2, is reported by a simple and short method from 2-methylbenzoic acid

Prediction of Pressure-Temperature Phase Envelopes of Multicomponent Hydrocarbon Systems

Mechanical Engineerin

Synthetic studies towards the nor-triterpene pfaffic acid: synthesis of DEF ring fragment via tandem radical cyclization rearrangement reactions

A tandem 5-exo-trig-vinyl-3-exo-radical cyclization-rearrangement reaction and its allylic radical version was developed (8 and 15 to 9 and 16 respectively) for the synthesis of DEF ring system of the nor-tritepene Pfaffic acid 1

Statistical experiment analysis of wear and mechanical behaviour of abaca/sisal fiber-based hybrid composites under liquid nitrogen environment

Ice accretion on various onshore and offshore infrastructures imparts hazardous effects sometimes beyond repair, which may be life-threatening. Therefore, it has become necessary to look for ways to detect and mitigate ice. Some ice mitigation techniques have been tested or in use in aviation and railway sectors, however, their applicability to other sectors/systems is still in the research phase. To make such systems autonomous, ice protection systems need to be accompanied by reliable ice detection systems, which include electronic, mechatronics, mechanical, and optical techniques. Comparing the benefits and limitations of all available methodologies, Infrared Thermography (IRT) appears to be one of the useful, non-destructive, and emerging techniques as it offers wide area monitoring instead of just point-based ice monitoring. This paper reviews the applications of IRT in the field of icing on various subject areas to provide valuable insights into the existing development of an intelligent and autonomous ice mitigation system for general applications

Finite Element Analysis of Propeller Shaft for Automotive and Naval Application

The Drive shaft is mainly used for power transmission from the engine to the rear differential. Parts are created by using creo software and the assembled model is exported to analysis Parasolid file and various analysis are performed. Structural analysis of drive shaft to with stand a torque of 10000nm at one where other side is fixed. Use of conventional steel for manufacturing of drive shaft has many disadvantages such as low specific stiffness and strength. Conventional drive shaft is made up into two parts to increase its fundamental natural bending frequency. Two-piece drive shaft increases the weight of drive shaft which is not desirable in today’s market. Many methods are available at present for the design optimization of structural systems and these methods based on mathematical programming techniques involving gradient search and direct search. These methods assume that the design variables are continuous. But in practical structural engineering optimization, almost all the design variables are discret

Mechanical Design and Analysis of AGV for Cost Reduction of Material Handling in Automobile Industries

oai:ojs2.mapletreejournals.com:article/1Automated Guided vehicle or AGV is one of material handling equipment that has been used widely in most automotive industry today as it provides more flexibility to the system. The basic concept of the AGV incorporates battery powered and driverless vehicles with programming capabilities for path selection and positioning. They are equipped to navigate a flexible guide path network that can be easily modified and expanded. Years ago when the AGV technology firstimplemented, it was called driverless vehicle and navigated base on embedded wire or reflected light from paint strip mounted on the floor where the route is preprogrammed in the AGV system. Instead of navigating using fixed path, the AGV now able to navigate freely distance it has traveled or using other landmark or equipment as a reference. Through this report, the types of AGV, the basic concept, the classification of the AGV, types of navigation techniques and thesteering mechanism that usually used in common AGV will be reviewed,. The, this report will be focusing on the mechanical design concept of the AGV which combines knowledge on mechanical parts such as the electric motor, gears, wheels, structure of the AGV, control system and so on

Design and analysis of air cooled radiator

In this work discussed about the problems associated with treatment and disposal of water have become more costly with government regulations and environmental concerns. The objective of the work is to increase the performance of thermic fluid heat exchanger by utilizing the single thermic fluid instead of double fluid presently used in the process industries. Thermic fluid offers outstanding high temperature performance including thermal stability and low vapor pressure. The project design comprises the idea of implementing two 3 way control valves to by – pass the inlet of thermic fluid to the air cooled radiator when the temperature of thermic fluid has increased after cycling through the process. The fluid flow simulation is conducted using commercial software, fluent. The pressure and temperature distribution along the tube length and tube width are presented and analyzed